20917463 has 12 divisors (see below), whose sum is σ = 25764912. Its totient is φ = 16873920.

The previous prime is 20917459. The next prime is 20917483. The reversal of 20917463 is 36471902.

It is not a de Polignac number, because 20917463 - 2² = 20917459 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20917483) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11723 + ... + 13388.

It is an arithmetic number, because the mean of its divisors is an integer number (2147076).

Almost surely, 2^20917463 is an apocalyptic number.

20917463 is a deficient number, since it is larger than the sum of its proper divisors (4847449).

20917463 is a wasteful number, since it uses less digits than its factorization.

20917463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25142 (or 25135 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 20917463 is about 4573.5613038419. The cubic root of 20917463 is about 275.5304933403.

The spelling of 20917463 in words is "twenty million, nine hundred seventeen thousand, four hundred sixty-three".