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20495188 = 2273773271
BaseRepresentation
bin100111000101…
…1101101010100
31102120021010001
41032023231110
520221321223
62011141044
7336130510
oct116135524
942507101
1020495188
111062937a
126a44784
13432793c
142a17140
151bec9ad
hex138bb54

20495188 has 48 divisors (see below), whose sum is σ = 42832384. Its totient is φ = 8398080.

The previous prime is 20495177. The next prime is 20495191. The reversal of 20495188 is 88159402.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75493 + ... + 75763.

Almost surely, 220495188 is an apocalyptic number.

20495188 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20495188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21416192).

20495188 is an abundant number, since it is smaller than the sum of its proper divisors (22337196).

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

20495188 is a wasteful number, since it uses less digits than its factorization.

20495188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 20495188 is about 4527.1611413777. The cubic root of 20495188 is about 273.6637678674.

The spelling of 20495188 in words is "twenty million, four hundred ninety-five thousand, one hundred eighty-eight".

Divisors: 1 2 4 7 14 28 37 73 74 146 148 259 271 292 511 518 542 1022 1036 1084 1897 2044 2701 3794 5402 7588 10027 10804 18907 19783 20054 37814 39566 40108 70189 75628 79132 138481 140378 276962 280756 553924 731971 1463942 2927884 5123797 10247594 20495188