20122556100 has 144 divisors (see below), whose sum is σ = 62062694400. Its totient is φ = 5019131520.

The previous prime is 20122556087. The next prime is 20122556137. The reversal of 20122556100 is 165522102.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 427957 + ... + 472643.

Almost surely, 2^20122556100 is an apocalyptic number.

20122556100 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 20122556100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31031347200).

20122556100 is an abundant number, since it is smaller than the sum of its proper divisors (41940138300).

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

20122556100 is a wasteful number, since it uses less digits than its factorization.

20122556100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44802 (or 44795 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The spelling of 20122556100 in words is "twenty billion, one hundred twenty-two million, five hundred fifty-six thousand, one hundred".