20520054100531 has 4 divisors (see below), whose sum is σ = 20520723168864. Its totient is φ = 20519385032200.

The previous prime is 20520054100517. The next prime is 20520054100547. The reversal of 20520054100531 is 13500145002502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20520054100531 - 2¹⁵ = 20520054067763 is a prime.

It is a super-2 number, since 2×20520054100531² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20520054100531.

It is not an unprimeable number, because it can be changed into a prime (20520054100561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 334488160 + ... + 334549501.

It is an arithmetic number, because the mean of its divisors is an integer number (5130180792216).

Almost surely, 2^{20520054100531} is an apocalyptic number.

20520054100531 is a deficient number, since it is larger than the sum of its proper divisors (669068333).

20520054100531 is an equidigital number, since it uses as much as digits as its factorization.

20520054100531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669068332.

The product of its (nonzero) digits is 6000, while the sum is 28.

The spelling of 20520054100531 in words is "twenty trillion, five hundred twenty billion, fifty-four million, one hundred thousand, five hundred thirty-one".