20607657 has 16 divisors (see below), whose sum is σ = 31466880. Its totient is φ = 11751552.

The previous prime is 20607641. The next prime is 20607673. The reversal of 20607657 is 75670602.

It is an interprime number because it is at equal distance from previous prime (20607641) and next prime (20607673).

It is not a de Polignac number, because 20607657 - 2⁴ = 20607641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20607857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16383 + ... + 17595.

It is an arithmetic number, because the mean of its divisors is an integer number (1966680).

Almost surely, 2^20607657 is an apocalyptic number.

It is an amenable number.

20607657 is a deficient number, since it is larger than the sum of its proper divisors (10859223).

20607657 is a wasteful number, since it uses less digits than its factorization.

20607657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2032.

The product of its (nonzero) digits is 17640, while the sum is 33.

The square root of 20607657 is about 4539.5657281286. The cubic root of 20607657 is about 274.1634389957.

The spelling of 20607657 in words is "twenty million, six hundred seven thousand, six hundred fifty-seven".