20730504 has 16 divisors (see below), whose sum is σ = 51826320. Its totient is φ = 6910160.

The previous prime is 20730491. The next prime is 20730529. The reversal of 20730504 is 40503702.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431862 + ... + 431909.

It is an arithmetic number, because the mean of its divisors is an integer number (3239145).

Almost surely, 2^20730504 is an apocalyptic number.

20730504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20730504 is an abundant number, since it is smaller than the sum of its proper divisors (31095816).

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

20730504 is a wasteful number, since it uses less digits than its factorization.

20730504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863780 (or 863776 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 20730504 is about 4553.0763226636. The cubic root of 20730504 is about 274.7071438864.

The spelling of 20730504 in words is "twenty million, seven hundred thirty thousand, five hundred four".