20459457 has 6 divisors (see below), whose sum is σ = 29552562. Its totient is φ = 13639632.

The previous prime is 20459419. The next prime is 20459459. The reversal of 20459457 is 75495402.

It can be written as a sum of positive squares in only one way, i.e., 19793601 + 665856 = 4449^2 + 816^2 .

It is not a de Polignac number, because 20459457 - 2¹⁰ = 20458433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20459459) 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, 1136628 + ... + 1136645.

It is an arithmetic number, because the mean of its divisors is an integer number (4925427).

Almost surely, 2^20459457 is an apocalyptic number.

It is an amenable number.

20459457 is a deficient number, since it is larger than the sum of its proper divisors (9093105).

20459457 is a wasteful number, since it uses less digits than its factorization.

20459457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2273279 (or 2273276 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 20459457 is about 4523.2131278550. The cubic root of 20459457 is about 273.5046416042.

The spelling of 20459457 in words is "twenty million, four hundred fifty-nine thousand, four hundred fifty-seven".