20130451320 has 128 divisors (see below), whose sum is σ = 69281879040. Its totient is φ = 4583700480.

The previous prime is 20130451273. The next prime is 20130451343. The reversal of 20130451320 is 2315403102.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

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, 175360 + ... + 266480.

It is an arithmetic number, because the mean of its divisors is an integer number (541264680).

Almost surely, 2^20130451320 is an apocalyptic number.

20130451320 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 20130451320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34640939520).

20130451320 is an abundant number, since it is smaller than the sum of its proper divisors (49151427720).

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

20130451320 is a wasteful number, since it uses less digits than its factorization.

20130451320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91405 (or 91401 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 20130451320 its reverse (2315403102), we get a palindrome (22445854422).

The spelling of 20130451320 in words is "twenty billion, one hundred thirty million, four hundred fifty-one thousand, three hundred twenty".