20152155100 has 144 divisors (see below), whose sum is σ = 56401390080. Its totient is φ = 6064531200.

The previous prime is 20152155097. The next prime is 20152155137. The reversal of 20152155100 is 155125102.

It is a happy number.

It is a super-2 number, since 2×20152155100² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent 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, 178177 + ... + 268423.

It is an arithmetic number, because the mean of its divisors is an integer number (391676320).

Almost surely, 2^20152155100 is an apocalyptic number.

20152155100 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 20152155100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28200695040).

20152155100 is an abundant number, since it is smaller than the sum of its proper divisors (36249234980).

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

20152155100 is a wasteful number, since it uses less digits than its factorization.

20152155100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90308 (or 90301 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 22.

The spelling of 20152155100 in words is "twenty billion, one hundred fifty-two million, one hundred fifty-five thousand, one hundred".