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20400330 = 2354391549
BaseRepresentation
bin100110111010…
…0100011001010
31102101102222210
41031310203022
520210302310
62005125550
7335254116
oct115644312
942342883
1020400330
1110574085
1269b98b6
1342c3702
1429d0746
151bce820
hex13748ca

20400330 has 32 divisors (see below), whose sum is σ = 49104000. Its totient is φ = 5424192.

The previous prime is 20400307. The next prime is 20400337. The reversal of 20400330 is 3300402.

It is not an unprimeable number, because it can be changed into a prime (20400337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12396 + ... + 13944.

It is an arithmetic number, because the mean of its divisors is an integer number (1534500).

Almost surely, 220400330 is an apocalyptic number.

20400330 is an abundant number, since it is smaller than the sum of its proper divisors (28703670).

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

20400330 is a wasteful number, since it uses less digits than its factorization.

20400330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998.

The product of its (nonzero) digits is 72, while the sum is 12.

The square root of 20400330 is about 4516.6724477208. The cubic root of 20400330 is about 273.2409149514.

Adding to 20400330 its product of nonzero digits (72), we get a palindrome (20400402).

Adding to 20400330 its reverse (3300402), we get a palindrome (23700732).

The spelling of 20400330 in words is "twenty million, four hundred thousand, three hundred thirty".

Divisors: 1 2 3 5 6 10 15 30 439 878 1317 1549 2195 2634 3098 4390 4647 6585 7745 9294 13170 15490 23235 46470 680011 1360022 2040033 3400055 4080066 6800110 10200165 20400330