20100515210878 has 32 divisors (see below), whose sum is σ = 31227560598528. Its totient is φ = 9697234579200.

The previous prime is 20100515210869. The next prime is 20100515210899. The reversal of 20100515210878 is 87801251500102.

It is a self number, because there is not a number n which added to its sum of digits gives 20100515210878.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 256848 + ... + 6345628.

It is an arithmetic number, because the mean of its divisors is an integer number (975861268704).

Almost surely, 2^{20100515210878} is an apocalyptic number.

20100515210878 is a deficient number, since it is larger than the sum of its proper divisors (11127045387650).

20100515210878 is a wasteful number, since it uses less digits than its factorization.

20100515210878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6089268.

The product of its (nonzero) digits is 44800, while the sum is 40.

The spelling of 20100515210878 in words is "twenty trillion, one hundred billion, five hundred fifteen million, two hundred ten thousand, eight hundred seventy-eight".