20157026556 has 24 divisors (see below), whose sum is σ = 47052915280. Its totient is φ = 6716172672.

The previous prime is 20157026551. The next prime is 20157026563. The reversal of 20157026556 is 65562075102.

It is a super-2 number, since 2×20157026556² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20157026551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324811 + ... + 381858.

Almost surely, 2^20157026556 is an apocalyptic number.

It is an amenable number.

20157026556 is an abundant number, since it is smaller than the sum of its proper divisors (26895888724).

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

20157026556 is a wasteful number, since it uses less digits than its factorization.

20157026556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709053 (or 709051 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 39.

The spelling of 20157026556 in words is "twenty billion, one hundred fifty-seven million, twenty-six thousand, five hundred fifty-six".