20919708 has 30 divisors (see below), whose sum is σ = 54689096. Its totient is φ = 6973128.

The previous prime is 20919697. The next prime is 20919709. The reversal of 20919708 is 80791902.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20919709) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 31960 + ... + 32607.

Almost surely, 2^20919708 is an apocalyptic number.

It is an amenable number.

20919708 is an abundant number, since it is smaller than the sum of its proper divisors (33769388).

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

20919708 is a wasteful number, since it uses less digits than its factorization.

20919708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64583 (or 64572 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 20919708 is about 4573.8067296291. The cubic root of 20919708 is about 275.5403502372.

The spelling of 20919708 in words is "twenty million, nine hundred nineteen thousand, seven hundred eight".