20535210440 has 32 divisors (see below), whose sum is σ = 46216847160. Its totient is φ = 8211840000.

The previous prime is 20535210427. The next prime is 20535210457. The reversal of 20535210440 is 4401253502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12548928484 + 7986281956 = 112022^2 + 89366^2 .

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, 82190 + ... + 218690.

Almost surely, 2^20535210440 is an apocalyptic number.

20535210440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20535210440 is an abundant number, since it is smaller than the sum of its proper divisors (25681636720).

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

20535210440 is a wasteful number, since it uses less digits than its factorization.

20535210440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140273 (or 140269 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 20535210440 its reverse (4401253502), we get a palindrome (24936463942).

The spelling of 20535210440 in words is "twenty billion, five hundred thirty-five million, two hundred ten thousand, four hundred forty".