20722504 has 16 divisors (see below), whose sum is σ = 42387120. Its totient is φ = 9419280.

The previous prime is 20722453. The next prime is 20722519. The reversal of 20722504 is 40522702.

It is a Harshad number since it is a multiple of its sum of digits (22).

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 3 ways as a sum of consecutive naturals, for example, 117654 + ... + 117829.

It is an arithmetic number, because the mean of its divisors is an integer number (2649195).

Almost surely, 2^20722504 is an apocalyptic number.

It is an amenable number.

20722504 is an abundant number, since it is smaller than the sum of its proper divisors (21664616).

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

20722504 is a wasteful number, since it uses less digits than its factorization.

20722504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235500 (or 235496 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 20722504 is about 4552.1977109963. The cubic root of 20722504 is about 274.6718024092.

The spelling of 20722504 in words is "twenty million, seven hundred twenty-two thousand, five hundred four".