20355533525 has 48 divisors (see below), whose sum is σ = 27166006800. Its totient is φ = 15075164160.

The previous prime is 20355533467. The next prime is 20355533533. The reversal of 20355533525 is 52533555302.

It can be written as a sum of positive squares in 24 ways, for example, as 3211035556 + 17144497969 = 56666^2 + 130937^2 .

It is not a de Polignac number, because 20355533525 - 2⁸ = 20355533269 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15791081 + ... + 15792369.

It is an arithmetic number, because the mean of its divisors is an integer number (565958475).

Almost surely, 2^20355533525 is an apocalyptic number.

20355533525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20355533525 is a deficient number, since it is larger than the sum of its proper divisors (6810473275).

20355533525 is a wasteful number, since it uses less digits than its factorization.

20355533525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898 (or 1893 counting only the distinct ones).

The product of its (nonzero) digits is 337500, while the sum is 38.

The spelling of 20355533525 in words is "twenty billion, three hundred fifty-five million, five hundred thirty-three thousand, five hundred twenty-five".