20278793855 has 16 divisors (see below), whose sum is σ = 24704114400. Its totient is φ = 15976785792.

The previous prime is 20278793839. The next prime is 20278793863. The reversal of 20278793855 is 55839787202.

It is a cyclic number.

It is not a de Polignac number, because 20278793855 - 2⁴ = 20278793839 is a prime.

It is a super-2 number, since 2×20278793855² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20278793855.

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, 2457797 + ... + 2466033.

It is an arithmetic number, because the mean of its divisors is an integer number (1544007150).

Almost surely, 2^20278793855 is an apocalyptic number.

20278793855 is a deficient number, since it is larger than the sum of its proper divisors (4425320545).

20278793855 is an equidigital number, since it uses as much as digits as its factorization.

20278793855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15658.

The product of its (nonzero) digits is 8467200, while the sum is 56.

The spelling of 20278793855 in words is "twenty billion, two hundred seventy-eight million, seven hundred ninety-three thousand, eight hundred fifty-five".