13445720 has 16 divisors (see below), whose sum is σ = 30252960. Its totient is φ = 5378272.

The previous prime is 13445717. The next prime is 13445737. The reversal of 13445720 is 2754431.

It is a self number, because there is not a number n which added to its sum of digits gives 13445720.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168032 + ... + 168111.

It is an arithmetic number, because the mean of its divisors is an integer number (1890810).

Almost surely, 2^13445720 is an apocalyptic number.

13445720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13445720 is an abundant number, since it is smaller than the sum of its proper divisors (16807240).

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

13445720 is a wasteful number, since it uses less digits than its factorization.

13445720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336154 (or 336150 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 13445720 is about 3666.8406019351. The cubic root of 13445720 is about 237.7906027250.

It can be divided in two parts, 134 and 45720, that added together give a palindrome (45854).

The spelling of 13445720 in words is "thirteen million, four hundred forty-five thousand, seven hundred twenty".