20940916 has 6 divisors (see below), whose sum is σ = 36646610. Its totient is φ = 10470456.

The previous prime is 20940901. The next prime is 20940967. The reversal of 20940916 is 61904902.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15968016 + 4972900 = 3996^2 + 2230^2 .

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 as a sum of consecutive naturals, namely, 2617611 + ... + 2617618.

Almost surely, 2^20940916 is an apocalyptic number.

It is an amenable number.

20940916 is a deficient number, since it is larger than the sum of its proper divisors (15705694).

20940916 is a wasteful number, since it uses less digits than its factorization.

20940916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5235233 (or 5235231 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 20940916 is about 4576.1245612418. The cubic root of 20940916 is about 275.6334313027.

The spelling of 20940916 in words is "twenty million, nine hundred forty thousand, nine hundred sixteen".