20255278731551 has 16 divisors (see below), whose sum is σ = 20890858205184. Its totient is φ = 19627197537024.

The previous prime is 20255278731547. The next prime is 20255278731563. The reversal of 20255278731551 is 15513787255202.

It is a cyclic number.

It is not a de Polignac number, because 20255278731551 - 2² = 20255278731547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20255278731493 and 20255278731502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20255278701551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92525615 + ... + 92744271.

It is an arithmetic number, because the mean of its divisors is an integer number (1305678637824).

Almost surely, 2^{20255278731551} is an apocalyptic number.

20255278731551 is a deficient number, since it is larger than the sum of its proper divisors (635579473633).

20255278731551 is a wasteful number, since it uses less digits than its factorization.

20255278731551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235790.

The product of its (nonzero) digits is 5880000, while the sum is 53.

The spelling of 20255278731551 in words is "twenty trillion, two hundred fifty-five billion, two hundred seventy-eight million, seven hundred thirty-one thousand, five hundred fifty-one".