20969057 has 4 divisors (see below), whose sum is σ = 21282096. Its totient is φ = 20656020.

The previous prime is 20969029. The next prime is 20969087. The reversal of 20969057 is 75096902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20969057 - 2²² = 16774753 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20969057.

It is not an unprimeable number, because it can be changed into a prime (20969017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156419 + ... + 156552.

It is an arithmetic number, because the mean of its divisors is an integer number (5320524).

Almost surely, 2^20969057 is an apocalyptic number.

It is an amenable number.

20969057 is a deficient number, since it is larger than the sum of its proper divisors (313039).

20969057 is an equidigital number, since it uses as much as digits as its factorization.

20969057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313038.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 20969057 is about 4579.1982922778. The cubic root of 20969057 is about 275.7568440586.

The spelling of 20969057 in words is "twenty million, nine hundred sixty-nine thousand, fifty-seven".