20257007 has 4 divisors (see below), whose sum is σ = 20315400. Its totient is φ = 20198616.

The previous prime is 20256967. The next prime is 20257067. The reversal of 20257007 is 70075202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20257007 - 2⁸ = 20256751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20257067) 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, 28673 + ... + 29370.

It is an arithmetic number, because the mean of its divisors is an integer number (5078850).

Almost surely, 2^20257007 is an apocalyptic number.

20257007 is a deficient number, since it is larger than the sum of its proper divisors (58393).

20257007 is an equidigital number, since it uses as much as digits as its factorization.

20257007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58392.

The product of its (nonzero) digits is 980, while the sum is 23.

The square root of 20257007 is about 4500.7784882173. The cubic root of 20257007 is about 272.5995237290.

The spelling of 20257007 in words is "twenty million, two hundred fifty-seven thousand, seven".