20877935900644 has 27 divisors (see below), whose sum is σ = 36657094473993. Its totient is φ = 10404593572848.

The previous prime is 20877935900629. The next prime is 20877935900681. The reversal of 20877935900644 is 44600953977802.

The square root of 20877935900644 is 4569238.

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

It can be written as a sum of positive squares in only one way, i.e., 1168669102500 + 19709266798144 = 1081050^2 + 4439512^2 .

It is a super-2 number, since 2×20877935900644² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2896893289 + ... + 2896900495.

Almost surely, 2^{20877935900644} is an apocalyptic number.

20877935900644 is the 4569238-th square number.

It is an amenable number.

20877935900644 is a deficient number, since it is larger than the sum of its proper divisors (15779158573349).

20877935900644 is an frugal number, since it uses more digits than its factorization.

20877935900644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15052 (or 7526 counting only the distinct ones).

The product of its (nonzero) digits is 91445760, while the sum is 64.

The spelling of 20877935900644 in words is "twenty trillion, eight hundred seventy-seven billion, nine hundred thirty-five million, nine hundred thousand, six hundred forty-four".