20212253440 has 72 divisors (see below), whose sum is σ = 49723284240. Its totient is φ = 7866372096.

The previous prime is 20212253401. The next prime is 20212253471. The reversal of 20212253440 is 4435221202.

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, 166030 + ... + 260749.

It is an arithmetic number, because the mean of its divisors is an integer number (690601170).

Almost surely, 2^20212253440 is an apocalyptic number.

20212253440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212253440 is an abundant number, since it is smaller than the sum of its proper divisors (29511030800).

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

20212253440 is an equidigital number, since it uses as much as digits as its factorization.

20212253440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426837 (or 426823 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 20212253440 its reverse (4435221202), we get a palindrome (24647474642).

The spelling of 20212253440 in words is "twenty billion, two hundred twelve million, two hundred fifty-three thousand, four hundred forty".