20154552100 has 72 divisors (see below), whose sum is σ = 46467963360. Its totient is φ = 7566059520.

The previous prime is 20154552097. The next prime is 20154552139. The reversal of 20154552100 is 125545102.

It is a super-2 number, since 2×20154552100² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

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, 153732 + ... + 252868.

It is an arithmetic number, because the mean of its divisors is an integer number (645388380).

Almost surely, 2^20154552100 is an apocalyptic number.

20154552100 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 20154552100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23233981680).

20154552100 is an abundant number, since it is smaller than the sum of its proper divisors (26313411260).

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

20154552100 is a wasteful number, since it uses less digits than its factorization.

20154552100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99277 (or 99270 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The spelling of 20154552100 in words is "twenty billion, one hundred fifty-four million, five hundred fifty-two thousand, one hundred".