20355555100 has 18 divisors (see below), whose sum is σ = 44171554784. Its totient is φ = 8142222000.

The previous prime is 20355555053. The next prime is 20355555107. The reversal of 20355555100 is 155555302.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20355555107) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 101777676 + ... + 101777875.

Almost surely, 2^20355555100 is an apocalyptic number.

20355555100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20355555100 is an abundant number, since it is smaller than the sum of its proper divisors (23815999684).

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

20355555100 is a wasteful number, since it uses less digits than its factorization.

20355555100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203555565 (or 203555558 counting only the distinct ones).

The product of its (nonzero) digits is 18750, while the sum is 31.

The spelling of 20355555100 in words is "twenty billion, three hundred fifty-five million, five hundred fifty-five thousand, one hundred".