20949057 has 16 divisors (see below), whose sum is σ = 31111360. Its totient is φ = 13932000.

The previous prime is 20949023. The next prime is 20949079. The reversal of 20949057 is 75094902.

It is not a de Polignac number, because 20949057 - 2⁸ = 20948801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20949007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15582 + ... + 16872.

It is an arithmetic number, because the mean of its divisors is an integer number (1944460).

Almost surely, 2^20949057 is an apocalyptic number.

20949057 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20949057 is a deficient number, since it is larger than the sum of its proper divisors (10162303).

20949057 is a wasteful number, since it uses less digits than its factorization.

20949057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901 (or 1895 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 20949057 is about 4577.0139829369. The cubic root of 20949057 is about 275.6691451343.

The spelling of 20949057 in words is "twenty million, nine hundred forty-nine thousand, fifty-seven".