20391502 has 16 divisors (see below), whose sum is σ = 31244400. Its totient is φ = 9979200.

The previous prime is 20391487. The next prime is 20391557. The reversal of 20391502 is 20519302.

It is a congruent number.

It is an unprimeable number.

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, 18877 + ... + 19927.

It is an arithmetic number, because the mean of its divisors is an integer number (1952775).

Almost surely, 2^20391502 is an apocalyptic number.

20391502 is a deficient number, since it is larger than the sum of its proper divisors (10852898).

20391502 is a wasteful number, since it uses less digits than its factorization.

20391502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 20391502 is about 4515.6950738508. The cubic root of 20391502 is about 273.2014953468.

The spelling of 20391502 in words is "twenty million, three hundred ninety-one thousand, five hundred two".