20396918 has 32 divisors (see below), whose sum is σ = 33868800. Its totient is φ = 9174816.

The previous prime is 20396867. The next prime is 20396933. The reversal of 20396918 is 81969302.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91355 + ... + 91577.

It is an arithmetic number, because the mean of its divisors is an integer number (1058400).

Almost surely, 2^20396918 is an apocalyptic number.

20396918 is a deficient number, since it is larger than the sum of its proper divisors (13471882).

20396918 is a wasteful number, since it uses less digits than its factorization.

20396918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 20396918 is about 4516.2947202325. The cubic root of 20396918 is about 273.2256807210.

The spelling of 20396918 in words is "twenty million, three hundred ninety-six thousand, nine hundred eighteen".