20474521 has 4 divisors (see below), whose sum is σ = 20521600. Its totient is φ = 20427444.

The previous prime is 20474507. The next prime is 20474549. The reversal of 20474521 is 12547402.

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 20474521 - 2⁹ = 20474009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20474581) 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, 22881 + ... + 23758.

It is an arithmetic number, because the mean of its divisors is an integer number (5130400).

Almost surely, 2^20474521 is an apocalyptic number.

It is an amenable number.

20474521 is a deficient number, since it is larger than the sum of its proper divisors (47079).

20474521 is an equidigital number, since it uses as much as digits as its factorization.

20474521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47078.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 20474521 is about 4524.8780094053. The cubic root of 20474521 is about 273.5717509635.

The spelling of 20474521 in words is "twenty million, four hundred seventy-four thousand, five hundred twenty-one".