20865957 has 8 divisors (see below), whose sum is σ = 31795776. Its totient is φ = 11923392.

The previous prime is 20865937. The next prime is 20865967. The reversal of 20865957 is 75956802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20865957 - 2⁸ = 20865701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20865937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 496788 + ... + 496829.

It is an arithmetic number, because the mean of its divisors is an integer number (3974472).

Almost surely, 2^20865957 is an apocalyptic number.

It is an amenable number.

20865957 is a deficient number, since it is larger than the sum of its proper divisors (10929819).

20865957 is an equidigital number, since it uses as much as digits as its factorization.

20865957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993627.

The product of its (nonzero) digits is 151200, while the sum is 42.

The square root of 20865957 is about 4567.9269915357. The cubic root of 20865957 is about 275.3041571342.

The spelling of 20865957 in words is "twenty million, eight hundred sixty-five thousand, nine hundred fifty-seven".