20515220712010 has 32 divisors (see below), whose sum is σ = 37373977435392. Its totient is φ = 8107315265280.

The previous prime is 20515220711983. The next prime is 20515220712017. The reversal of 20515220712010 is 1021702251502.

It is a self number, because there is not a number n which added to its sum of digits gives 20515220712010.

It is not an unprimeable number, because it can be changed into a prime (20515220712017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28836774 + ... + 29539633.

It is an arithmetic number, because the mean of its divisors is an integer number (1167936794856).

Almost surely, 2^{20515220712010} is an apocalyptic number.

20515220712010 is a deficient number, since it is larger than the sum of its proper divisors (16858756723382).

20515220712010 is a wasteful number, since it uses less digits than its factorization.

20515220712010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58376838.

The product of its (nonzero) digits is 2800, while the sum is 28.

Adding to 20515220712010 its reverse (1021702251502), we get a palindrome (21536922963512).

The spelling of 20515220712010 in words is "twenty trillion, five hundred fifteen billion, two hundred twenty million, seven hundred twelve thousand, ten".