20913737 has 16 divisors (see below), whose sum is σ = 23876160. Its totient is φ = 18159552.

The previous prime is 20913719. The next prime is 20913773. The reversal of 20913737 is 73731902.

It is a cyclic number.

It is not a de Polignac number, because 20913737 - 2⁸ = 20913481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20913707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55883 + ... + 56255.

It is an arithmetic number, because the mean of its divisors is an integer number (1492260).

Almost surely, 2^20913737 is an apocalyptic number.

It is an amenable number.

20913737 is a deficient number, since it is larger than the sum of its proper divisors (2962423).

20913737 is a wasteful number, since it uses less digits than its factorization.

20913737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632.

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 20913737 is about 4573.1539444895. The cubic root of 20913737 is about 275.5141324081.

The spelling of 20913737 in words is "twenty million, nine hundred thirteen thousand, seven hundred thirty-seven".