20147457 has 16 divisors (see below), whose sum is σ = 29721600. Its totient is φ = 12037200.

The previous prime is 20147453. The next prime is 20147459. The reversal of 20147457 is 75474102.

It is not a de Polignac number, because 20147457 - 2² = 20147453 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20147453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1957 + ... + 6642.

It is an arithmetic number, because the mean of its divisors is an integer number (1857600).

Almost surely, 2^20147457 is an apocalyptic number.

It is an amenable number.

20147457 is a deficient number, since it is larger than the sum of its proper divisors (9574143).

20147457 is a wasteful number, since it uses less digits than its factorization.

20147457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8684.

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 20147457 is about 4488.5918727369. The cubic root of 20147457 is about 272.1072286639.

The spelling of 20147457 in words is "twenty million, one hundred forty-seven thousand, four hundred fifty-seven".