20722975 has 24 divisors (see below), whose sum is σ = 31629920. Its totient is φ = 13115520.

The previous prime is 20722969. The next prime is 20722979. The reversal of 20722975 is 57922702.

It is not a de Polignac number, because 20722975 - 2³ = 20722967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20722975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20722979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2280 + ... + 6829.

Almost surely, 2^20722975 is an apocalyptic number.

20722975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20722975 is a deficient number, since it is larger than the sum of its proper divisors (10906945).

20722975 is a wasteful number, since it uses less digits than its factorization.

20722975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9139 (or 9134 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 20722975 is about 4552.2494439563. The cubic root of 20722975 is about 274.6738833906.

The spelling of 20722975 in words is "twenty million, seven hundred twenty-two thousand, nine hundred seventy-five".