20930537 has 4 divisors (see below), whose sum is σ = 20946000. Its totient is φ = 20915076.

The previous prime is 20930513. The next prime is 20930579. The reversal of 20930537 is 73503902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20930537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20930597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5483 + ... + 8480.

It is an arithmetic number, because the mean of its divisors is an integer number (5236500).

Almost surely, 2^20930537 is an apocalyptic number.

It is an amenable number.

20930537 is a deficient number, since it is larger than the sum of its proper divisors (15463).

20930537 is a wasteful number, since it uses less digits than its factorization.

20930537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15462.

The product of its (nonzero) digits is 5670, while the sum is 29.

The square root of 20930537 is about 4574.9903825036. The cubic root of 20930537 is about 275.5878861420.

The spelling of 20930537 in words is "twenty million, nine hundred thirty thousand, five hundred thirty-seven".