20090916 has 60 divisors (see below), whose sum is σ = 53462640. Its totient is φ = 6577200.

The previous prime is 20090909. The next prime is 20090927. The reversal of 20090916 is 61909002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 20090916.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18591 + ... + 19641.

It is an arithmetic number, because the mean of its divisors is an integer number (891044).

Almost surely, 2^20090916 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20090916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26731320).

20090916 is an abundant number, since it is smaller than the sum of its proper divisors (33371724).

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

20090916 is a wasteful number, since it uses less digits than its factorization.

20090916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126 (or 1115 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 20090916 is about 4482.2891472996. The cubic root of 20090916 is about 271.8524466428.

Adding to 20090916 its reverse (61909002), we get a palindrome (81999918).

The spelling of 20090916 in words is "twenty million, ninety thousand, nine hundred sixteen".