20756306172 has 48 divisors (see below), whose sum is σ = 55376842752. Its totient is φ = 5927513280.

The previous prime is 20756306171. The next prime is 20756306209. The reversal of 20756306172 is 27160365702.

It is a self number, because there is not a number n which added to its sum of digits gives 20756306172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20756306171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118798 + ... + 235850.

It is an arithmetic number, because the mean of its divisors is an integer number (1153684224).

Almost surely, 2^20756306172 is an apocalyptic number.

It is an amenable number.

20756306172 is an abundant number, since it is smaller than the sum of its proper divisors (34620536580).

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

20756306172 is a wasteful number, since it uses less digits than its factorization.

20756306172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119178 (or 119176 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 39.

It can be divided in two parts, 2075630 and 6172, that added together give a palindrome (2081802).

The spelling of 20756306172 in words is "twenty billion, seven hundred fifty-six million, three hundred six thousand, one hundred seventy-two".