20618923 has 8 divisors (see below), whose sum is σ = 22510208. Its totient is φ = 18771264.

The previous prime is 20618903. The next prime is 20618929. The reversal of 20618923 is 32981602.

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 20618923 - 2²¹ = 18521771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20618929) 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, 9915 + ... + 11812.

It is an arithmetic number, because the mean of its divisors is an integer number (2813776).

Almost surely, 2^20618923 is an apocalyptic number.

20618923 is a deficient number, since it is larger than the sum of its proper divisors (1891285).

20618923 is a wasteful number, since it uses less digits than its factorization.

20618923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21813.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 20618923 is about 4540.8064261759. The cubic root of 20618923 is about 274.2133906976.

The spelling of 20618923 in words is "twenty million, six hundred eighteen thousand, nine hundred twenty-three".