20423251315055 has 128 divisors (see below), whose sum is σ = 27495179550720. Its totient is φ = 14496873431040.

The previous prime is 20423251315039. The next prime is 20423251315067. The reversal of 20423251315055 is 55051315232402.

It is not a de Polignac number, because 20423251315055 - 2⁴ = 20423251315039 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6755953274 + ... + 6755956296.

It is an arithmetic number, because the mean of its divisors is an integer number (214806090240).

Almost surely, 2^{20423251315055} is an apocalyptic number.

20423251315055 is a deficient number, since it is larger than the sum of its proper divisors (7071928235665).

20423251315055 is a wasteful number, since it uses less digits than its factorization.

20423251315055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3681.

The product of its (nonzero) digits is 180000, while the sum is 38.

Adding to 20423251315055 its reverse (55051315232402), we get a palindrome (75474566547457).

The spelling of 20423251315055 in words is "twenty trillion, four hundred twenty-three billion, two hundred fifty-one million, three hundred fifteen thousand, fifty-five".