20221977616 has 45 divisors (see below), whose sum is σ = 39805883901. Its totient is φ = 9952004736.

The previous prime is 20221977599. The next prime is 20221977623. The reversal of 20221977616 is 61677912202.

The square root of 20221977616 is 142204.

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., 11478979600 + 8742998016 = 107140^2 + 93504^2 .

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, 41523325 + ... + 41523811.

Almost surely, 2^20221977616 is an apocalyptic number.

20221977616 is the 142204-th square number.

It is an amenable number.

20221977616 is a deficient number, since it is larger than the sum of its proper divisors (19583906285).

20221977616 is an frugal number, since it uses more digits than its factorization.

20221977616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128 (or 562 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 20221977616 in words is "twenty billion, two hundred twenty-one million, nine hundred seventy-seven thousand, six hundred sixteen".