20163939 has 8 divisors (see below), whose sum is σ = 28054272. Its totient is φ = 12858120.

The previous prime is 20163931. The next prime is 20163991. The reversal of 20163939 is 93936102.

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

It is not a de Polignac number, because 20163939 - 2³ = 20163931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20163931) 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, 146047 + ... + 146184.

It is an arithmetic number, because the mean of its divisors is an integer number (3506784).

Almost surely, 2^20163939 is an apocalyptic number.

20163939 is a deficient number, since it is larger than the sum of its proper divisors (7890333).

20163939 is a wasteful number, since it uses less digits than its factorization.

20163939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292257.

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 20163939 is about 4490.4274852179. The cubic root of 20163939 is about 272.1814092238.

The spelling of 20163939 in words is "twenty million, one hundred sixty-three thousand, nine hundred thirty-nine".