20390708 has 24 divisors (see below), whose sum is σ = 38581032. Its totient is φ = 9373824.

The previous prime is 20390707. The next prime is 20390717. The reversal of 20390708 is 80709302.

It can be written as a sum of positive squares in 4 ways, for example, as 68644 + 20322064 = 262^2 + 4508^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20390707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15866 + ... + 17102.

It is an arithmetic number, because the mean of its divisors is an integer number (1607543).

Almost surely, 2^20390708 is an apocalyptic number.

It is an amenable number.

20390708 is a deficient number, since it is larger than the sum of its proper divisors (18190324).

20390708 is a wasteful number, since it uses less digits than its factorization.

20390708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571 (or 1569 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 20390708 is about 4515.6071574042. The cubic root of 20390708 is about 273.1979493468.

The spelling of 20390708 in words is "twenty million, three hundred ninety thousand, seven hundred eight".