20903886 has 16 divisors (see below), whose sum is σ = 46453200. Its totient is φ = 6967944.

The previous prime is 20903881. The next prime is 20903887. The reversal of 20903886 is 68830902.

It is a self number, because there is not a number n which added to its sum of digits gives 20903886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20903881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193501 + ... + 193608.

It is an arithmetic number, because the mean of its divisors is an integer number (2903325).

Almost surely, 2^20903886 is an apocalyptic number.

20903886 is an abundant number, since it is smaller than the sum of its proper divisors (25549314).

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

20903886 is a wasteful number, since it uses less digits than its factorization.

20903886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387120 (or 387114 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20903886 is about 4572.0767710090. The cubic root of 20903886 is about 275.4708671296.

The spelling of 20903886 in words is "twenty million, nine hundred three thousand, eight hundred eighty-six".