20457153 has 6 divisors (see below), whose sum is σ = 29549234. Its totient is φ = 13638096.

The previous prime is 20457149. The next prime is 20457161. The reversal of 20457153 is 35175402.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16548624 + 3908529 = 4068^2 + 1977^2 .

It is not a de Polignac number, because 20457153 - 2² = 20457149 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 (20457133) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1136500 + ... + 1136517.

Almost surely, 2^20457153 is an apocalyptic number.

It is an amenable number.

20457153 is a deficient number, since it is larger than the sum of its proper divisors (9092081).

20457153 is a wasteful number, since it uses less digits than its factorization.

20457153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2273023 (or 2273020 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 20457153 is about 4522.9584344763. The cubic root of 20457153 is about 273.4943744965.

The spelling of 20457153 in words is "twenty million, four hundred fifty-seven thousand, one hundred fifty-three".