20013915 has 32 divisors (see below), whose sum is σ = 33465600. Its totient is φ = 10200960.

The previous prime is 20013893. The next prime is 20013937. The reversal of 20013915 is 51931002.

It is an interprime number because it is at equal distance from previous prime (20013893) and next prime (20013937).

It is not a de Polignac number, because 20013915 - 2⁵ = 20013883 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20013891 and 20013900.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 60300 + ... + 60630.

It is an arithmetic number, because the mean of its divisors is an integer number (1045800).

Almost surely, 2^20013915 is an apocalyptic number.

20013915 is a deficient number, since it is larger than the sum of its proper divisors (13451685).

20013915 is a wasteful number, since it uses less digits than its factorization.

20013915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 20013915 is about 4473.6914287867. The cubic root of 20013915 is about 271.5046989341.

Adding to 20013915 its reverse (51931002), we get a palindrome (71944917).

The spelling of 20013915 in words is "twenty million, thirteen thousand, nine hundred fifteen".