20550465900 has 108 divisors (see below), whose sum is σ = 64467477984. Its totient is φ = 5475600000.

The previous prime is 20550465869. The next prime is 20550465917. The reversal of 20550465900 is 956405502.

20550465900 is a `hidden beast` number, since 2 + 0 + 5 + 504 + 65 + 90 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1162125 + ... + 1179675.

Almost surely, 2^20550465900 is an apocalyptic number.

20550465900 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 20550465900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32233738992).

20550465900 is an abundant number, since it is smaller than the sum of its proper divisors (43917012084).

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

20550465900 is a wasteful number, since it uses less digits than its factorization.

20550465900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18872 (or 18862 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 20550465900 in words is "twenty billion, five hundred fifty million, four hundred sixty-five thousand, nine hundred".