20631896 has 8 divisors (see below), whose sum is σ = 38684820. Its totient is φ = 10315944.

The previous prime is 20631869. The next prime is 20631899. The reversal of 20631896 is 69813602.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20631899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1289486 + ... + 1289501.

Almost surely, 2^20631896 is an apocalyptic number.

It is an amenable number.

20631896 is a deficient number, since it is larger than the sum of its proper divisors (18052924).

20631896 is a wasteful number, since it uses less digits than its factorization.

20631896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2578993 (or 2578989 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20631896 is about 4542.2346923073. The cubic root of 20631896 is about 274.2708884389.

The spelling of 20631896 in words is "twenty million, six hundred thirty-one thousand, eight hundred ninety-six".