20878378255 has 16 divisors (see below), whose sum is σ = 28642259520. Its totient is φ = 14312074752.

The previous prime is 20878378237. The next prime is 20878378277. The reversal of 20878378255 is 55287387802.

It is a cyclic number.

It is not a de Polignac number, because 20878378255 - 2⁹ = 20878377743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20878378196 and 20878378205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19881 + ... + 205309.

It is an arithmetic number, because the mean of its divisors is an integer number (1790141220).

Almost surely, 2^20878378255 is an apocalyptic number.

20878378255 is a deficient number, since it is larger than the sum of its proper divisors (7763881265).

20878378255 is a wasteful number, since it uses less digits than its factorization.

20878378255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188658.

The product of its (nonzero) digits is 7526400, while the sum is 55.

The spelling of 20878378255 in words is "twenty billion, eight hundred seventy-eight million, three hundred seventy-eight thousand, two hundred fifty-five".