20657001 has 4 divisors (see below), whose sum is σ = 27542672. Its totient is φ = 13771332.

The previous prime is 20656991. The next prime is 20657027. The reversal of 20657001 is 10075602.

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 not a de Polignac number, because 20657001 - 2⁷ = 20656873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20657041) 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, 3442831 + ... + 3442836.

It is an arithmetic number, because the mean of its divisors is an integer number (6885668).

Almost surely, 2^20657001 is an apocalyptic number.

It is an amenable number.

20657001 is a deficient number, since it is larger than the sum of its proper divisors (6885671).

20657001 is an equidigital number, since it uses as much as digits as its factorization.

20657001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6885670.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 20657001 is about 4544.9973597352. The cubic root of 20657001 is about 274.3820881034.

The spelling of 20657001 in words is "twenty million, six hundred fifty-seven thousand, one".