20513108 has 24 divisors (see below), whose sum is σ = 44756544. Its totient is φ = 7992000.

The previous prime is 20513093. The next prime is 20513113. The reversal of 20513108 is 80131502.

It is a self number, because there is not a number n which added to its sum of digits gives 20513108.

It is a congruent number.

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, 32993 + ... + 33608.

It is an arithmetic number, because the mean of its divisors is an integer number (1864856).

Almost surely, 2^20513108 is an apocalyptic number.

20513108 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20513108 is an abundant number, since it is smaller than the sum of its proper divisors (24243436).

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

20513108 is a wasteful number, since it uses less digits than its factorization.

20513108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66623 (or 66621 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 20513108 is about 4529.1398741924. The cubic root of 20513108 is about 273.7435040819.

The spelling of 20513108 in words is "twenty million, five hundred thirteen thousand, one hundred eight".