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20674290 = 2357137573
BaseRepresentation
bin100111011011…
…1011011110010
31102220100210110
41032313123302
520243034130
62015042150
7340504620
oct116673362
942810713
1020674290
111074099a
126b10356
13438b310
142a62510
151c35ab0
hex13b76f2

20674290 has 64 divisors (see below), whose sum is σ = 61076736. Its totient is φ = 4361472.

The previous prime is 20674273. The next prime is 20674307. The reversal of 20674290 is 9247602.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20674273) and next prime (20674307).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1057 + ... + 6516.

It is an arithmetic number, because the mean of its divisors is an integer number (954324).

Almost surely, 220674290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20674290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30538368).

20674290 is an abundant number, since it is smaller than the sum of its proper divisors (40402446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20674290 is a wasteful number, since it uses less digits than its factorization.

20674290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7603.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 20674290 is about 4546.8989432359. The cubic root of 20674290 is about 274.4586153316.

The spelling of 20674290 in words is "twenty million, six hundred seventy-four thousand, two hundred ninety".

Divisors: 1 2 3 5 6 7 10 13 14 15 21 26 30 35 39 42 65 70 78 91 105 130 182 195 210 273 390 455 546 910 1365 2730 7573 15146 22719 37865 45438 53011 75730 98449 106022 113595 159033 196898 227190 265055 295347 318066 492245 530110 590694 689143 795165 984490 1378286 1476735 1590330 2067429 2953470 3445715 4134858 6891430 10337145 20674290