20945604 has 12 divisors (see below), whose sum is σ = 48873104. Its totient is φ = 6981864.

The previous prime is 20945591. The next prime is 20945609. The reversal of 20945604 is 40654902.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (20945609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 872722 + ... + 872745.

Almost surely, 2^20945604 is an apocalyptic number.

It is an amenable number.

20945604 is an abundant number, since it is smaller than the sum of its proper divisors (27927500).

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

20945604 is a wasteful number, since it uses less digits than its factorization.

20945604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745474 (or 1745472 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 20945604 is about 4576.6367563966. The cubic root of 20945604 is about 275.6539982653.

The spelling of 20945604 in words is "twenty million, nine hundred forty-five thousand, six hundred four".