20205220040 has 32 divisors (see below), whose sum is σ = 45470290680. Its totient is φ = 8080568832.

The previous prime is 20205220039. The next prime is 20205220153. The reversal of 20205220040 is 4002250202.

It can be written as a sum of positive squares in 4 ways, for example, as 6683716516 + 13521503524 = 81754^2 + 116282^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181634 + ... + 270926.

Almost surely, 2^20205220040 is an apocalyptic number.

20205220040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20205220040 is an abundant number, since it is smaller than the sum of its proper divisors (25265070640).

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

20205220040 is a wasteful number, since it uses less digits than its factorization.

20205220040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94961 (or 94957 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

Adding to 20205220040 its reverse (4002250202), we get a palindrome (24207470242).

The spelling of 20205220040 in words is "twenty billion, two hundred five million, two hundred twenty thousand, forty".