13020537 has 4 divisors (see below), whose sum is σ = 17360720. Its totient is φ = 8680356.

The previous prime is 13020523. The next prime is 13020541. The reversal of 13020537 is 73502031.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13020537 - 2¹⁵ = 12987769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13020577) 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, 2170087 + ... + 2170092.

It is an arithmetic number, because the mean of its divisors is an integer number (4340180).

Almost surely, 2^13020537 is an apocalyptic number.

It is an amenable number.

13020537 is a deficient number, since it is larger than the sum of its proper divisors (4340183).

13020537 is an equidigital number, since it uses as much as digits as its factorization.

13020537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4340182.

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 13020537 is about 3608.3981210504. The cubic root of 13020537 is about 235.2572225005.

Adding to 13020537 its reverse (73502031), we get a palindrome (86522568).

The spelling of 13020537 in words is "thirteen million, twenty thousand, five hundred thirty-seven".