20889539621 has 32 divisors (see below), whose sum is σ = 22203054720. Its totient is φ = 19632098304.

The previous prime is 20889539603. The next prime is 20889539623. The reversal of 20889539621 is 12693598802.

It is a cyclic number.

It is not a de Polignac number, because 20889539621 - 2¹⁰ = 20889538597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20889539623) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51074465 + ... + 51074873.

It is an arithmetic number, because the mean of its divisors is an integer number (693845460).

Almost surely, 2^20889539621 is an apocalyptic number.

It is an amenable number.

20889539621 is a deficient number, since it is larger than the sum of its proper divisors (1313515099).

20889539621 is a wasteful number, since it uses less digits than its factorization.

20889539621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The spelling of 20889539621 in words is "twenty billion, eight hundred eighty-nine million, five hundred thirty-nine thousand, six hundred twenty-one".