20878377264 has 120 divisors (see below), whose sum is σ = 61425446992. Its totient is φ = 6864030720.

The previous prime is 20878377227. The next prime is 20878377277. The reversal of 20878377264 is 46277387802.

20878377264 is a `hidden beast` number, since 2 + 0 + 8 + 7 + 8 + 377 + 264 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 20878377264.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 247044 + ... + 320604.

Almost surely, 2^20878377264 is an apocalyptic number.

20878377264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20878377264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30712723496).

20878377264 is an abundant number, since it is smaller than the sum of its proper divisors (40547069728).

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

20878377264 is an equidigital number, since it uses as much as digits as its factorization.

20878377264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73657 (or 73639 counting only the distinct ones).

The product of its (nonzero) digits is 6322176, while the sum is 54.

The spelling of 20878377264 in words is "twenty billion, eight hundred seventy-eight million, three hundred seventy-seven thousand, two hundred sixty-four".