20415116225 has 72 divisors (see below), whose sum is σ = 31113901440. Its totient is φ = 13227553920.

The previous prime is 20415116207. The next prime is 20415116231. The reversal of 20415116225 is 52261151402.

It is not a de Polignac number, because 20415116225 - 2⁸ = 20415115969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1663562 + ... + 1675788.

It is an arithmetic number, because the mean of its divisors is an integer number (432137520).

Almost surely, 2^20415116225 is an apocalyptic number.

20415116225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20415116225 is a deficient number, since it is larger than the sum of its proper divisors (10698785215).

20415116225 is a wasteful number, since it uses less digits than its factorization.

20415116225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12327 (or 12315 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 20415116225 its reverse (52261151402), we get a palindrome (72676267627).

The spelling of 20415116225 in words is "twenty billion, four hundred fifteen million, one hundred sixteen thousand, two hundred twenty-five".