13021020 has 48 divisors (see below), whose sum is σ = 40511520. Its totient is φ = 3472128.

The previous prime is 13021009. The next prime is 13021027. The reversal of 13021020 is 2012031.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 13020993 and 13021011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13021027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11517 + ... + 12596.

It is an arithmetic number, because the mean of its divisors is an integer number (843990).

Almost surely, 2^13021020 is an apocalyptic number.

13021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13021020 is an abundant number, since it is smaller than the sum of its proper divisors (27490500).

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

13021020 is a wasteful number, since it uses less digits than its factorization.

13021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24131 (or 24123 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 13021020 is about 3608.4650476345. The cubic root of 13021020 is about 235.2601314393.

Adding to 13021020 its reverse (2012031), we get a palindrome (15033051).

The spelling of 13021020 in words is "thirteen million, twenty-one thousand, twenty".