20457420 has 24 divisors (see below), whose sum is σ = 57280944. Its totient is φ = 5455296.

The previous prime is 20457413. The next prime is 20457431. The reversal of 20457420 is 2475402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170419 + ... + 170538.

It is an arithmetic number, because the mean of its divisors is an integer number (2386706).

Almost surely, 2^20457420 is an apocalyptic number.

20457420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20457420 is an abundant number, since it is smaller than the sum of its proper divisors (36823524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20457420 is a wasteful number, since it uses less digits than its factorization.

20457420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340969 (or 340967 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 20457420 is about 4522.9879504593. The cubic root of 20457420 is about 273.4955643440.

The spelling of 20457420 in words is "twenty million, four hundred fifty-seven thousand, four hundred twenty".