20739517132356 has 81 divisors (see below), whose sum is σ = 57624888357309. Its totient is φ = 6284611080000.

The previous prime is 20739517132351. The next prime is 20739517132417. The reversal of 20739517132356 is 65323171593702.

It is a happy number.

The square root of 20739517132356 is 4554066.

It is a perfect power (a square), and thus also a powerful number.

20739517132356 is a `hidden beast` number, since 2 + 0 + 7 + 3 + 95 + 171 + 32 + 356 = 666.

It can be written as a sum of positive squares in only one way, i.e., 216442674756 + 20523074457600 = 465234^2 + 4530240^2 .

It is a super-2 number, since 2×20739517132356² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20739517132351) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 300533856 + ... + 300602856.

Almost surely, 2^{20739517132356} is an apocalyptic number.

20739517132356 is the 4554066-th square number.

It is an amenable number.

20739517132356 is an abundant number, since it is smaller than the sum of its proper divisors (36885371224953).

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

20739517132356 is an frugal number, since it uses more digits than its factorization.

20739517132356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138034 (or 69017 counting only the distinct ones).

The product of its (nonzero) digits is 7144200, while the sum is 54.

The spelling of 20739517132356 in words is "twenty trillion, seven hundred thirty-nine billion, five hundred seventeen million, one hundred thirty-two thousand, three hundred fifty-six".