20320734 has 16 divisors (see below), whose sum is σ = 46447488. Its totient is φ = 5805912.

The previous prime is 20320723. The next prime is 20320739. The reversal of 20320734 is 43702302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 20320734.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241872 + ... + 241955.

It is an arithmetic number, because the mean of its divisors is an integer number (2902968).

Almost surely, 2^20320734 is an apocalyptic number.

20320734 is an abundant number, since it is smaller than the sum of its proper divisors (26126754).

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

20320734 is a wasteful number, since it uses less digits than its factorization.

20320734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483839.

The product of its (nonzero) digits is 1008, while the sum is 21.

The square root of 20320734 is about 4507.8524820584. The cubic root of 20320734 is about 272.8850835960.

The spelling of 20320734 in words is "twenty million, three hundred twenty thousand, seven hundred thirty-four".