20215388 has 12 divisors (see below), whose sum is σ = 35438592. Its totient is φ = 10090080.

The previous prime is 20215381. The next prime is 20215417. The reversal of 20215388 is 88351202.

It is a self number, because there is not a number n which added to its sum of digits gives 20215388.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20215381) 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 3 ways as a sum of consecutive naturals, for example, 1628 + ... + 6563.

It is an arithmetic number, because the mean of its divisors is an integer number (2953216).

Almost surely, 2^20215388 is an apocalyptic number.

It is an amenable number.

20215388 is a deficient number, since it is larger than the sum of its proper divisors (15223204).

20215388 is a wasteful number, since it uses less digits than its factorization.

20215388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8812 (or 8810 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 20215388 is about 4496.1525774822. The cubic root of 20215388 is about 272.4127060960.

The spelling of 20215388 in words is "twenty million, two hundred fifteen thousand, three hundred eighty-eight".