13240020 has 24 divisors (see below), whose sum is σ = 37072224. Its totient is φ = 3530656.

The previous prime is 13239997. The next prime is 13240021. The reversal of 13240020 is 2004231.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 13239978 and 13240005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13240021) 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, 110274 + ... + 110393.

It is an arithmetic number, because the mean of its divisors is an integer number (1544676).

Almost surely, 2^13240020 is an apocalyptic number.

13240020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13240020 is an abundant number, since it is smaller than the sum of its proper divisors (23832204).

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

13240020 is a wasteful number, since it uses less digits than its factorization.

13240020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220679 (or 220677 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 13240020 is about 3638.6838279796. The cubic root of 13240020 is about 236.5717488402.

Adding to 13240020 its reverse (2004231), we get a palindrome (15244251).

The spelling of 13240020 in words is "thirteen million, two hundred forty thousand, twenty".