20863236 has 12 divisors (see below), whose sum is σ = 48680912. Its totient is φ = 6954408.

The previous prime is 20863229. The next prime is 20863247. The reversal of 20863236 is 63236802.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 869290 + ... + 869313.

Almost surely, 2^20863236 is an apocalyptic number.

It is an amenable number.

20863236 is an abundant number, since it is smaller than the sum of its proper divisors (27817676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20863236 is a wasteful number, since it uses less digits than its factorization.

20863236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738610 (or 1738608 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 20863236 is about 4567.6291443155. The cubic root of 20863236 is about 275.2921897116.

The spelling of 20863236 in words is "twenty million, eight hundred sixty-three thousand, two hundred thirty-six".