20564946 has 24 divisors (see below), whose sum is σ = 44675280. Its totient is φ = 6836856.

The previous prime is 20564941. The next prime is 20564969. The reversal of 20564946 is 64946502.

20564946 is a `hidden beast` number, since 2 + 0 + 5 + 649 + 4 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20564946.

It is not an unprimeable number, because it can be changed into a prime (20564941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6685 + ... + 9263.

It is an arithmetic number, because the mean of its divisors is an integer number (1861470).

Almost surely, 2^20564946 is an apocalyptic number.

20564946 is an abundant number, since it is smaller than the sum of its proper divisors (24110334).

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

20564946 is a wasteful number, since it uses less digits than its factorization.

20564946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030 (or 3027 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 20564946 is about 4534.8589834746. The cubic root of 20564946 is about 273.9738995153.

The spelling of 20564946 in words is "twenty million, five hundred sixty-four thousand, nine hundred forty-six".