13400020 has 12 divisors (see below), whose sum is σ = 28140084. Its totient is φ = 5360000.

The previous prime is 13399999. The next prime is 13400027. The reversal of 13400020 is 2000431.

It can be written as a sum of positive squares in 2 ways, for example, as 9659664 + 3740356 = 3108^2 + 1934^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13400027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 334981 + ... + 335020.

It is an arithmetic number, because the mean of its divisors is an integer number (2345007).

Almost surely, 2^13400020 is an apocalyptic number.

13400020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13400020 is an abundant number, since it is smaller than the sum of its proper divisors (14740064).

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

13400020 is a wasteful number, since it uses less digits than its factorization.

13400020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670010 (or 670008 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 13400020 is about 3660.6037753354. The cubic root of 13400020 is about 237.5208919756.

Adding to 13400020 its reverse (2000431), we get a palindrome (15400451).

The spelling of 13400020 in words is "thirteen million, four hundred thousand, twenty".