20748947 has 8 divisors (see below), whose sum is σ = 21099120. Its totient is φ = 20401920.

The previous prime is 20748929. The next prime is 20748961. The reversal of 20748947 is 74984702.

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 20748947 - 2²⁴ = 3971731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20748907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15047 + ... + 16367.

It is an arithmetic number, because the mean of its divisors is an integer number (2637390).

Almost surely, 2^20748947 is an apocalyptic number.

20748947 is a deficient number, since it is larger than the sum of its proper divisors (350173).

20748947 is a wasteful number, since it uses less digits than its factorization.

20748947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 20748947 is about 4555.1012063400. The cubic root of 20748947 is about 274.7885846165.

The spelling of 20748947 in words is "twenty million, seven hundred forty-eight thousand, nine hundred forty-seven".