20412521 has 4 divisors (see below), whose sum is σ = 20502672. Its totient is φ = 20322372.

The previous prime is 20412503. The next prime is 20412541. The reversal of 20412521 is 12521402.

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 a cyclic number.

It is not a de Polignac number, because 20412521 - 2¹⁰ = 20411497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20412521.

It is not an unprimeable number, because it can be changed into a prime (20412541) 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, 44735 + ... + 45188.

It is an arithmetic number, because the mean of its divisors is an integer number (5125668).

Almost surely, 2^20412521 is an apocalyptic number.

It is an amenable number.

20412521 is a deficient number, since it is larger than the sum of its proper divisors (90151).

20412521 is an equidigital number, since it uses as much as digits as its factorization.

20412521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90150.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 20412521 is about 4518.0218016296. The cubic root of 20412521 is about 273.2953326443.

Adding to 20412521 its reverse (12521402), we get a palindrome (32933923).

The spelling of 20412521 in words is "twenty million, four hundred twelve thousand, five hundred twenty-one".