20780708 has 24 divisors (see below), whose sum is σ = 39463032. Its totient is φ = 9517824.

The previous prime is 20780689. The next prime is 20780729. The reversal of 20780708 is 80708702.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6927424 + 13853284 = 2632^2 + 3722^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5666 + ... + 8582.

It is an arithmetic number, because the mean of its divisors is an integer number (1644293).

Almost surely, 2^20780708 is an apocalyptic number.

It is an amenable number.

20780708 is a deficient number, since it is larger than the sum of its proper divisors (18682324).

20780708 is a wasteful number, since it uses less digits than its factorization.

20780708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3071 (or 3069 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 20780708 is about 4558.5861843339. The cubic root of 20780708 is about 274.9287220227.

The spelling of 20780708 in words is "twenty million, seven hundred eighty thousand, seven hundred eight".