20535423525 has 36 divisors (see below), whose sum is σ = 37145436900. Its totient is φ = 10843776000.

The previous prime is 20535423521. The next prime is 20535423533. The reversal of 20535423525 is 52532453502.

20535423525 is a `hidden beast` number, since 205 + 3 + 5 + 423 + 5 + 25 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 3372589476 + 17162834049 = 58074^2 + 131007^2 .

It is not a de Polignac number, because 20535423525 - 2² = 20535423521 is a prime.

It is a super-2 number, since 2×20535423525² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20535423525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20535423521) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 429100 + ... + 474549.

Almost surely, 2^20535423525 is an apocalyptic number.

20535423525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20535423525 is a deficient number, since it is larger than the sum of its proper divisors (16610013375).

20535423525 is a wasteful number, since it uses less digits than its factorization.

20535423525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903766 (or 903758 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 36.

The spelling of 20535423525 in words is "twenty billion, five hundred thirty-five million, four hundred twenty-three thousand, five hundred twenty-five".