20747579 has 8 divisors (see below), whose sum is σ = 20993280. Its totient is φ = 20503656.

The previous prime is 20747567. The next prime is 20747581. The reversal of 20747579 is 97574702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20747579 - 2¹² = 20743483 is a prime.

It is a super-2 number, since 2×20747579² = 860924068722482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20747509) 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, 47042 + ... + 47480.

It is an arithmetic number, because the mean of its divisors is an integer number (2624160).

Almost surely, 2^20747579 is an apocalyptic number.

20747579 is a deficient number, since it is larger than the sum of its proper divisors (245701).

20747579 is a wasteful number, since it uses less digits than its factorization.

20747579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889.

The product of its (nonzero) digits is 123480, while the sum is 41.

The square root of 20747579 is about 4554.9510425470. The cubic root of 20747579 is about 274.7825454499.

The spelling of 20747579 in words is "twenty million, seven hundred forty-seven thousand, five hundred seventy-nine".