20632857 has 16 divisors (see below), whose sum is σ = 31749120. Its totient is φ = 11674512.

The previous prime is 20632853. The next prime is 20632861. The reversal of 20632857 is 75823602.

It is an interprime number because it is at equal distance from previous prime (20632853) and next prime (20632861).

It is not a de Polignac number, because 20632857 - 2² = 20632853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20632853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2607 + ... + 6932.

It is an arithmetic number, because the mean of its divisors is an integer number (1984320).

Almost surely, 2^20632857 is an apocalyptic number.

It is an amenable number.

20632857 is a deficient number, since it is larger than the sum of its proper divisors (11116263).

20632857 is a wasteful number, since it uses less digits than its factorization.

20632857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9652.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 20632857 is about 4542.3404760101. The cubic root of 20632857 is about 274.2751467360.

The spelling of 20632857 in words is "twenty million, six hundred thirty-two thousand, eight hundred fifty-seven".