20906964 has 48 divisors (see below), whose sum is σ = 58376640. Its totient is φ = 6432480.

The previous prime is 20906939. The next prime is 20906969. The reversal of 20906964 is 46960902.

It is a super-2 number, since 2×20906964² = 874202287394592, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20906969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6042 + ... + 8849.

It is an arithmetic number, because the mean of its divisors is an integer number (1216180).

Almost surely, 2^20906964 is an apocalyptic number.

It is an amenable number.

20906964 is an abundant number, since it is smaller than the sum of its proper divisors (37469676).

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

20906964 is a wasteful number, since it uses less digits than its factorization.

20906964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14917 (or 14909 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 20906964 is about 4572.4133671399. The cubic root of 20906964 is about 275.4843870674.

The spelling of 20906964 in words is "twenty million, nine hundred six thousand, nine hundred sixty-four".