20305032156100 has 72 divisors (see below), whose sum is σ = 44365828656968. Its totient is φ = 8066115302400.

The previous prime is 20305032156089. The next prime is 20305032156113. The reversal of 20305032156100 is 165123050302.

It can be written as a sum of positive squares in 12 ways, for example, as 4817910860676 + 15487121295424 = 2194974^2 + 3935368^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12502072 + ... + 14032528.

Almost surely, 2^{20305032156100} is an apocalyptic number.

20305032156100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20305032156100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22182914328484).

20305032156100 is an abundant number, since it is smaller than the sum of its proper divisors (24060796500868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20305032156100 is a wasteful number, since it uses less digits than its factorization.

20305032156100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1531385 (or 1531378 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The spelling of 20305032156100 in words is "twenty trillion, three hundred five billion, thirty-two million, one hundred fifty-six thousand, one hundred".