20878487802 has 16 divisors (see below), whose sum is σ = 46396639680. Its totient is φ = 6959495916.

The previous prime is 20878487753. The next prime is 20878487813.

20878487802 is a `hidden beast` number, since 2 + 0 + 87 + 8 + 487 + 80 + 2 = 666.

20878487802 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×20878487802² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 386638663 = 20878487802 / (2 + 0 + 8 + 7 + 8 + 4 + 8 + 7 + 8 + 0 + 2).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 193319278 + ... + 193319385.

It is an arithmetic number, because the mean of its divisors is an integer number (2899789980).

Almost surely, 2^20878487802 is an apocalyptic number.

20878487802 is an abundant number, since it is smaller than the sum of its proper divisors (25518151878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20878487802 is a wasteful number, since it uses less digits than its factorization.

20878487802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386638674 (or 386638668 counting only the distinct ones).

The product of its (nonzero) digits is 3211264, while the sum is 54.

The spelling of 20878487802 in words is "twenty billion, eight hundred seventy-eight million, four hundred eighty-seven thousand, eight hundred two".