20646912 has 176 divisors, whose sum is σ = 66028032. Its totient is φ = 5652480.

The previous prime is 20646877. The next prime is 20646929. The reversal of 20646912 is 21964602.

It is a tau number, because it is divible by the number of its divisors (176).

It is a self number, because there is not a number n which added to its sum of digits gives 20646912.

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, 439273 + ... + 439319.

Almost surely, 2^20646912 is an apocalyptic number.

20646912 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20646912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33014016).

20646912 is an abundant number, since it is smaller than the sum of its proper divisors (45381120).

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

20646912 is a wasteful number, since it uses less digits than its factorization.

20646912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 20646912 is about 4543.8873225466. The cubic root of 20646912 is about 274.3374108907.

The spelling of 20646912 in words is "twenty million, six hundred forty-six thousand, nine hundred twelve".