20957001 has 16 divisors (see below), whose sum is σ = 30184896. Its totient is φ = 12856896.

The previous prime is 20956993. The next prime is 20957003. The reversal of 20957001 is 10075902.

It is not a de Polignac number, because 20957001 - 2³ = 20956993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20957003) 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, 16671 + ... + 17883.

It is an arithmetic number, because the mean of its divisors is an integer number (1886556).

Almost surely, 2^20957001 is an apocalyptic number.

It is an amenable number.

20957001 is a deficient number, since it is larger than the sum of its proper divisors (9227895).

20957001 is a wasteful number, since it uses less digits than its factorization.

20957001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672.

The product of its (nonzero) digits is 630, while the sum is 24.

The square root of 20957001 is about 4577.8817153788. The cubic root of 20957001 is about 275.7039858264.

The spelling of 20957001 in words is "twenty million, nine hundred fifty-seven thousand, one".