20013473 has 4 divisors (see below), whose sum is σ = 20883648. Its totient is φ = 19143300.

The previous prime is 20013463. The next prime is 20013481. The reversal of 20013473 is 37431002.

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 20013473 - 2¹² = 20009377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20013443) 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, 435053 + ... + 435098.

It is an arithmetic number, because the mean of its divisors is an integer number (5220912).

Almost surely, 2^20013473 is an apocalyptic number.

20013473 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20013473 is a deficient number, since it is larger than the sum of its proper divisors (870175).

20013473 is an equidigital number, since it uses as much as digits as its factorization.

20013473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870174.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 20013473 is about 4473.6420285937. The cubic root of 20013473 is about 271.5027002254.

Adding to 20013473 its reverse (37431002), we get a palindrome (57444475).

The spelling of 20013473 in words is "twenty million, thirteen thousand, four hundred seventy-three".