20989427542084 has 27 divisors (see below), whose sum is σ = 37649913251293. Its totient is φ = 10238561885600.

The previous prime is 20989427542067. The next prime is 20989427542093. The reversal of 20989427542084 is 48024572498902.

The square root of 20989427542084 is 4581422.

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., 1011388239684 + 19978039302400 = 1005678^2 + 4469680^2 .

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, 375648669 + ... + 375704539.

Almost surely, 2^{20989427542084} is an apocalyptic number.

20989427542084 is the 4581422-nd square number.

It is an amenable number.

20989427542084 is a deficient number, since it is larger than the sum of its proper divisors (16660485709209).

20989427542084 is an frugal number, since it uses more digits than its factorization.

20989427542084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111828 (or 55914 counting only the distinct ones).

The product of its (nonzero) digits is 92897280, while the sum is 64.

The spelling of 20989427542084 in words is "twenty trillion, nine hundred eighty-nine billion, four hundred twenty-seven million, five hundred forty-two thousand, eighty-four".