20963631 has 24 divisors (see below), whose sum is σ = 31790640. Its totient is φ = 12213504.

The previous prime is 20963597. The next prime is 20963633. The reversal of 20963631 is 13636902.

It is a happy number.

It is not a de Polignac number, because 20963631 - 2¹¹ = 20961583 is a prime.

It is a super-2 number, since 2×20963631² = 878947649408322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20963633) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13335 + ... + 14823.

It is an arithmetic number, because the mean of its divisors is an integer number (1324610).

Almost surely, 2^20963631 is an apocalyptic number.

20963631 is a deficient number, since it is larger than the sum of its proper divisors (10827009).

20963631 is a wasteful number, since it uses less digits than its factorization.

20963631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543 (or 1524 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 20963631 is about 4578.6057921599. The cubic root of 20963631 is about 275.7330568546.

The spelling of 20963631 in words is "twenty million, nine hundred sixty-three thousand, six hundred thirty-one".