20055511240 has 16 divisors (see below), whose sum is σ = 45124900380. Its totient is φ = 8022204480.

The previous prime is 20055511213. The next prime is 20055511243. The reversal of 20055511240 is 4211555002.

It can be written as a sum of positive squares in 2 ways, for example, as 20051126404 + 4384836 = 141602^2 + 2094^2 .

It is not an unprimeable number, because it can be changed into a prime (20055511243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250693851 + ... + 250693930.

Almost surely, 2^20055511240 is an apocalyptic number.

20055511240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20055511240 is an abundant number, since it is smaller than the sum of its proper divisors (25069389140).

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

20055511240 is a wasteful number, since it uses less digits than its factorization.

20055511240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501387792 (or 501387788 counting only the distinct ones).

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

The spelling of 20055511240 in words is "twenty billion, fifty-five million, five hundred eleven thousand, two hundred forty".