20355551125 has 32 divisors (see below), whose sum is σ = 31266144000. Its totient is φ = 12884385600.

The previous prime is 20355551101. The next prime is 20355551129. The reversal of 20355551125 is 52115555302.

It is not a de Polignac number, because 20355551125 - 2⁷ = 20355550997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20355551129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 883375 + ... + 906124.

It is an arithmetic number, because the mean of its divisors is an integer number (977067000).

Almost surely, 2^20355551125 is an apocalyptic number.

20355551125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20355551125 is a deficient number, since it is larger than the sum of its proper divisors (10910592875).

20355551125 is a wasteful number, since it uses less digits than its factorization.

20355551125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789534 (or 1789524 counting only the distinct ones).

The product of its (nonzero) digits is 37500, while the sum is 34.

The spelling of 20355551125 in words is "twenty billion, three hundred fifty-five million, five hundred fifty-one thousand, one hundred twenty-five".