20122320440 has 16 divisors (see below), whose sum is σ = 45275221080. Its totient is φ = 8048928160.

The previous prime is 20122320397. The next prime is 20122320457. The reversal of 20122320440 is 4402322102.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251528966 + ... + 251529045.

Almost surely, 2^20122320440 is an apocalyptic number.

20122320440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20122320440 is an abundant number, since it is smaller than the sum of its proper divisors (25152900640).

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

20122320440 is a wasteful number, since it uses less digits than its factorization.

20122320440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503058022 (or 503058018 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20122320440 its reverse (4402322102), we get a palindrome (24524642542).

The spelling of 20122320440 in words is "twenty billion, one hundred twenty-two million, three hundred twenty thousand, four hundred forty".