20021531315454 has 12 divisors (see below), whose sum is σ = 43379984516856. Its totient is φ = 6673843771812.

The previous prime is 20021531315449. The next prime is 20021531315509. The reversal of 20021531315454 is 45451313512002.

20021531315454 is a `hidden beast` number, since 2 + 0 + 0 + 21 + 53 + 131 + 5 + 454 = 666.

It is a super-3 number, since 3×20021531315454³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 556153647634 + ... + 556153647669.

It is an arithmetic number, because the mean of its divisors is an integer number (3614998709738).

Almost surely, 2^{20021531315454} is an apocalyptic number.

20021531315454 is an abundant number, since it is smaller than the sum of its proper divisors (23358453201402).

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

20021531315454 is a wasteful number, since it uses less digits than its factorization.

20021531315454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112307295311 (or 1112307295308 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

Adding to 20021531315454 its reverse (45451313512002), we get a palindrome (65472844827456).

The spelling of 20021531315454 in words is "twenty trillion, twenty-one billion, five hundred thirty-one million, three hundred fifteen thousand, four hundred fifty-four".