20913768 has 32 divisors (see below), whose sum is σ = 58094400. Its totient is φ = 6971184.

The previous prime is 20913719. The next prime is 20913773. The reversal of 20913768 is 86731902.

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

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, 48196 + ... + 48627.

It is an arithmetic number, because the mean of its divisors is an integer number (1815450).

Almost surely, 2^20913768 is an apocalyptic number.

It is an amenable number.

20913768 is an abundant number, since it is smaller than the sum of its proper divisors (37180632).

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

20913768 is a wasteful number, since it uses less digits than its factorization.

20913768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96838 (or 96828 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 20913768 is about 4573.1573338340. The cubic root of 20913768 is about 275.5142685377.

The spelling of 20913768 in words is "twenty million, nine hundred thirteen thousand, seven hundred sixty-eight".