20965820 has 12 divisors (see below), whose sum is σ = 44028264. Its totient is φ = 8386320.

The previous prime is 20965817. The next prime is 20965829. The reversal of 20965820 is 2856902.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20965829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 524126 + ... + 524165.

It is an arithmetic number, because the mean of its divisors is an integer number (3669022).

Almost surely, 2^20965820 is an apocalyptic number.

20965820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20965820 is an abundant number, since it is smaller than the sum of its proper divisors (23062444).

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

20965820 is a wasteful number, since it uses less digits than its factorization.

20965820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048300 (or 1048298 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20965820 is about 4578.8448324878. The cubic root of 20965820 is about 275.7426537712.

The spelling of 20965820 in words is "twenty million, nine hundred sixty-five thousand, eight hundred twenty".