20645996 has 24 divisors (see below), whose sum is σ = 43088640. Its totient is φ = 8463312.

The previous prime is 20645981. The next prime is 20646011. The reversal of 20645996 is 69954602.

It is an interprime number because it is at equal distance from previous prime (20645981) and next prime (20646011).

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 7 ways as a sum of consecutive naturals, for example, 15386 + ... + 16673.

It is an arithmetic number, because the mean of its divisors is an integer number (1795360).

Almost surely, 2^20645996 is an apocalyptic number.

It is an amenable number.

20645996 is an abundant number, since it is smaller than the sum of its proper divisors (22442644).

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

20645996 is a wasteful number, since it uses less digits than its factorization.

20645996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32093 (or 32091 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 20645996 is about 4543.7865266757. The cubic root of 20645996 is about 274.3333538387. Note that the first 4 decimals are identical.

The spelling of 20645996 in words is "twenty million, six hundred forty-five thousand, nine hundred ninety-six".