20130440 has 32 divisors (see below), whose sum is σ = 49412160. Its totient is φ = 7320000.

The previous prime is 20130413. The next prime is 20130449. The reversal of 20130440 is 4403102.

It is a super-2 number, since 2×20130440² = 810469229187200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20130449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22436 + ... + 23315.

It is an arithmetic number, because the mean of its divisors is an integer number (1544130).

Almost surely, 2^20130440 is an apocalyptic number.

20130440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20130440 is an abundant number, since it is smaller than the sum of its proper divisors (29281720).

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

20130440 is a wasteful number, since it uses less digits than its factorization.

20130440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45773 (or 45769 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20130440 is about 4486.6958889588. The cubic root of 20130440 is about 272.0305977689.

Adding to 20130440 its reverse (4403102), we get a palindrome (24533542).

The spelling of 20130440 in words is "twenty million, one hundred thirty thousand, four hundred forty".