20724957 has 32 divisors (see below), whose sum is σ = 34590720. Its totient is φ = 12150000.

The previous prime is 20724943. The next prime is 20724959. The reversal of 20724957 is 75942702.

It is not a de Polignac number, because 20724957 - 2⁴ = 20724941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20724959) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8082 + ... + 10332.

It is an arithmetic number, because the mean of its divisors is an integer number (1080960).

Almost surely, 2^20724957 is an apocalyptic number.

20724957 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20724957 is a deficient number, since it is larger than the sum of its proper divisors (13865763).

20724957 is a wasteful number, since it uses less digits than its factorization.

20724957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2302 (or 2296 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 20724957 is about 4552.4671333245. The cubic root of 20724957 is about 274.6826399564.

The spelling of 20724957 in words is "twenty million, seven hundred twenty-four thousand, nine hundred fifty-seven".