20111455320 has 256 divisors, whose sum is σ = 66846850560. Its totient is φ = 4800000000.

The previous prime is 20111455319. The next prime is 20111455361. The reversal of 20111455320 is 2355411102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 33463020 + ... + 33463620.

It is an arithmetic number, because the mean of its divisors is an integer number (261120510).

Almost surely, 2^20111455320 is an apocalyptic number.

20111455320 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 20111455320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33423425280).

20111455320 is an abundant number, since it is smaller than the sum of its proper divisors (46735395240).

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

20111455320 is a wasteful number, since it uses less digits than its factorization.

20111455320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978 (or 974 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 20111455320 its reverse (2355411102), we get a palindrome (22466866422).

The spelling of 20111455320 in words is "twenty billion, one hundred eleven million, four hundred fifty-five thousand, three hundred twenty".