20253221380 has 96 divisors (see below), whose sum is σ = 51322844160. Its totient is φ = 6558330240.

The previous prime is 20253221377. The next prime is 20253221393. The reversal of 20253221380 is 8312235202.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 868959 + ... + 891961.

It is an arithmetic number, because the mean of its divisors is an integer number (534612960).

Almost surely, 2^20253221380 is an apocalyptic number.

20253221380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20253221380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25661422080).

20253221380 is an abundant number, since it is smaller than the sum of its proper divisors (31069622780).

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

20253221380 is a wasteful number, since it uses less digits than its factorization.

20253221380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23369 (or 23367 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 20253221380 its reverse (8312235202), we get a palindrome (28565456582).

The spelling of 20253221380 in words is "twenty billion, two hundred fifty-three million, two hundred twenty-one thousand, three hundred eighty".