20287458 has 12 divisors (see below), whose sum is σ = 43956198. Its totient is φ = 6762480.

The previous prime is 20287457. The next prime is 20287471. The reversal of 20287458 is 85478202.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11269449 + 9018009 = 3357^2 + 3003^2 .

It is not an unprimeable number, because it can be changed into a prime (20287451) 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, 563523 + ... + 563558.

Almost surely, 2^20287458 is an apocalyptic number.

20287458 is an abundant number, since it is smaller than the sum of its proper divisors (23668740).

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

20287458 is a wasteful number, since it uses less digits than its factorization.

20287458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127089 (or 1127086 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 20287458 is about 4504.1600770843. The cubic root of 20287458 is about 272.7360488691.

The spelling of 20287458 in words is "twenty million, two hundred eighty-seven thousand, four hundred fifty-eight".