20454504100 has 18 divisors (see below), whose sum is σ = 44386274114. Its totient is φ = 8181801600.

The previous prime is 20454504089. The next prime is 20454504127. The reversal of 20454504100 is 140545402.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 6100547236 + 14353956864 = 78106^2 + 119808^2 .

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 5 ways as a sum of consecutive naturals, for example, 102272421 + ... + 102272620.

Almost surely, 2^20454504100 is an apocalyptic number.

20454504100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20454504100 is an abundant number, since it is smaller than the sum of its proper divisors (23931770014).

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

20454504100 is a wasteful number, since it uses less digits than its factorization.

20454504100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204545055 (or 204545048 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The spelling of 20454504100 in words is "twenty billion, four hundred fifty-four million, five hundred four thousand, one hundred".