20505154525 has 6 divisors (see below), whose sum is σ = 25426391642. Its totient is φ = 16404123600.

The previous prime is 20505154519. The next prime is 20505154541. The reversal of 20505154525 is 52545150502.

It can be written as a sum of positive squares in 3 ways, for example, as 849955716 + 19655198809 = 29154^2 + 140197^2 .

It is not a de Polignac number, because 20505154525 - 2³ = 20505154517 is a prime.

It is a super-2 number, since 2×20505154525² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

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, 410103066 + ... + 410103115.

Almost surely, 2^20505154525 is an apocalyptic number.

20505154525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20505154525 is a deficient number, since it is larger than the sum of its proper divisors (4921237117).

20505154525 is an equidigital number, since it uses as much as digits as its factorization.

20505154525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820206191 (or 820206186 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 34.

The spelling of 20505154525 in words is "twenty billion, five hundred five million, one hundred fifty-four thousand, five hundred twenty-five".