20265561100 has 36 divisors (see below), whose sum is σ = 44168353600. Its totient is φ = 8070816960.

The previous prime is 20265561091. The next prime is 20265561223. The reversal of 20265561100 is 116556202.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 419580 + ... + 465379.

Almost surely, 2^20265561100 is an apocalyptic number.

20265561100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20265561100 is an abundant number, since it is smaller than the sum of its proper divisors (23902792500).

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

20265561100 is a wasteful number, since it uses less digits than its factorization.

20265561100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885202 (or 885195 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 20265561100 in words is "twenty billion, two hundred sixty-five million, five hundred sixty-one thousand, one hundred".