20215716 has 24 divisors (see below), whose sum is σ = 47281920. Its totient is φ = 6722592.

The previous prime is 20215711. The next prime is 20215721. The reversal of 20215716 is 61751202.

It is an interprime number because it is at equal distance from previous prime (20215711) and next prime (20215721).

It is not an unprimeable number, because it can be changed into a prime (20215711) 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, 3990 + ... + 7506.

It is an arithmetic number, because the mean of its divisors is an integer number (1970080).

Almost surely, 2^20215716 is an apocalyptic number.

It is an amenable number.

20215716 is an abundant number, since it is smaller than the sum of its proper divisors (27066204).

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

20215716 is a wasteful number, since it uses less digits than its factorization.

20215716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4003 (or 4001 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 20215716 is about 4496.1890529647. The cubic root of 20215716 is about 272.4141794107.

Adding to 20215716 its reverse (61751202), we get a palindrome (81966918).

The spelling of 20215716 in words is "twenty million, two hundred fifteen thousand, seven hundred sixteen".