20992377 has 16 divisors (see below), whose sum is σ = 32532480. Its totient is φ = 11791632.

The previous prime is 20992343. The next prime is 20992379. The reversal of 20992377 is 77329902.

It is not a de Polignac number, because 20992377 - 2⁷ = 20992249 is a prime.

It is a super-2 number, since 2×20992377² = 881359784220258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20992379) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7233 + ... + 9710.

It is an arithmetic number, because the mean of its divisors is an integer number (2033280).

Almost surely, 2^20992377 is an apocalyptic number.

It is an amenable number.

20992377 is a deficient number, since it is larger than the sum of its proper divisors (11540103).

20992377 is a wasteful number, since it uses less digits than its factorization.

20992377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17012.

The product of its (nonzero) digits is 47628, while the sum is 39.

The square root of 20992377 is about 4581.7438819733. The cubic root of 20992377 is about 275.8590306154.

The spelling of 20992377 in words is "twenty million, nine hundred ninety-two thousand, three hundred seventy-seven".