20396915 has 32 divisors (see below), whose sum is σ = 31518720. Its totient is φ = 12297600.

The previous prime is 20396867. The next prime is 20396933. The reversal of 20396915 is 51969302.

It is not a de Polignac number, because 20396915 - 2⁶ = 20396851 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11081 + ... + 12789.

It is an arithmetic number, because the mean of its divisors is an integer number (984960).

Almost surely, 2^20396915 is an apocalyptic number.

20396915 is a deficient number, since it is larger than the sum of its proper divisors (11121805).

20396915 is a wasteful number, since it uses less digits than its factorization.

20396915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1763.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 20396915 is about 4516.2943881018. The cubic root of 20396915 is about 273.2256673256.

The spelling of 20396915 in words is "twenty million, three hundred ninety-six thousand, nine hundred fifteen".