20901916 has 12 divisors (see below), whose sum is σ = 41803888. Its totient is φ = 8957952.

The previous prime is 20901911. The next prime is 20901931. The reversal of 20901916 is 61910902.

20901916 = 1725² + 1726² + ... + 1731².

20901916 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 746497 = 20901916 / (2 + 0 + 9 + 0 + 1 + 9 + 1 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20901911) 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, 373221 + ... + 373276.

Almost surely, 2^20901916 is an apocalyptic number.

It is an amenable number.

20901916 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20901916 is a wasteful number, since it uses less digits than its factorization.

20901916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746508 (or 746506 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 20901916 is about 4571.8613277308. The cubic root of 20901916 is about 275.4622133214.

The spelling of 20901916 in words is "twenty million, nine hundred one thousand, nine hundred sixteen".