13020405 has 16 divisors (see below), whose sum is σ = 20900160. Its totient is φ = 6921728.

The previous prime is 13020383. The next prime is 13020431. The reversal of 13020405 is 50402031.

It is a cyclic number.

It is not a de Polignac number, because 13020405 - 2⁵ = 13020373 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4066 + ... + 6524.

It is an arithmetic number, because the mean of its divisors is an integer number (1306260).

Almost surely, 2^13020405 is an apocalyptic number.

13020405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13020405 is a deficient number, since it is larger than the sum of its proper divisors (7879755).

13020405 is a wasteful number, since it uses less digits than its factorization.

13020405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2820.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 13020405 is about 3608.3798303394. The cubic root of 13020405 is about 235.2564274985.

Adding to 13020405 its reverse (50402031), we get a palindrome (63422436).

The spelling of 13020405 in words is "thirteen million, twenty thousand, four hundred five".