20740538 has 32 divisors (see below), whose sum is σ = 38779776. Its totient is φ = 8100288.

The previous prime is 20740513. The next prime is 20740553. The reversal of 20740538 is 83504702.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20740538.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14420 + ... + 15792.

It is an arithmetic number, because the mean of its divisors is an integer number (1211868).

Almost surely, 2^20740538 is an apocalyptic number.

20740538 is a deficient number, since it is larger than the sum of its proper divisors (18039238).

20740538 is a wasteful number, since it uses less digits than its factorization.

20740538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1478.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20740538 is about 4554.1780817179. The cubic root of 20740538 is about 274.7514580829.

The spelling of 20740538 in words is "twenty million, seven hundred forty thousand, five hundred thirty-eight".