20787460 has 24 divisors (see below), whose sum is σ = 44081856. Its totient is φ = 8233440.

The previous prime is 20787457. The next prime is 20787479. The reversal of 20787460 is 6478702.

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, 2986 + ... + 7105.

It is an arithmetic number, because the mean of its divisors is an integer number (1836744).

Almost surely, 2^20787460 is an apocalyptic number.

20787460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20787460 is an abundant number, since it is smaller than the sum of its proper divisors (23294396).

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

20787460 is a wasteful number, since it uses less digits than its factorization.

20787460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10203 (or 10201 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 20787460 is about 4559.3267046791. The cubic root of 20787460 is about 274.9584951135.

The spelling of 20787460 in words is "twenty million, seven hundred eighty-seven thousand, four hundred sixty".