20488540 has 12 divisors (see below), whose sum is σ = 43025976. Its totient is φ = 8195408.

The previous prime is 20488537. The next prime is 20488579. The reversal of 20488540 is 4588402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 512194 + ... + 512233.

It is an arithmetic number, because the mean of its divisors is an integer number (3585498).

Almost surely, 2^20488540 is an apocalyptic number.

20488540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20488540 is an abundant number, since it is smaller than the sum of its proper divisors (22537436).

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

20488540 is a wasteful number, since it uses less digits than its factorization.

20488540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024436 (or 1024434 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 31.

The square root of 20488540 is about 4526.4268468628. The cubic root of 20488540 is about 273.6341753361.

The spelling of 20488540 in words is "twenty million, four hundred eighty-eight thousand, five hundred forty".