20950866 has 32 divisors (see below), whose sum is σ = 46725120. Its totient is φ = 6958512.

The previous prime is 20950849. The next prime is 20950871. The reversal of 20950866 is 66805902.

It is a super-2 number, since 2×20950866² = 877877572299912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20950866.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20176 + ... + 21188.

It is an arithmetic number, because the mean of its divisors is an integer number (1460160).

Almost surely, 2^20950866 is an apocalyptic number.

20950866 is an abundant number, since it is smaller than the sum of its proper divisors (25774254).

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

20950866 is a wasteful number, since it uses less digits than its factorization.

20950866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407 (or 1401 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 20950866 is about 4577.2115965946. The cubic root of 20950866 is about 275.6770797974.

The spelling of 20950866 in words is "twenty million, nine hundred fifty thousand, eight hundred sixty-six".