20813413 has 4 divisors (see below), whose sum is σ = 21718368. Its totient is φ = 19908460.

The previous prime is 20813399. The next prime is 20813447. The reversal of 20813413 is 31431802.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31431802 = 2 ⋅15715901.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20813413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20813473) 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, 452443 + ... + 452488.

It is an arithmetic number, because the mean of its divisors is an integer number (5429592).

Almost surely, 2^20813413 is an apocalyptic number.

20813413 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20813413 is a deficient number, since it is larger than the sum of its proper divisors (904955).

20813413 is an equidigital number, since it uses as much as digits as its factorization.

20813413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904954.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20813413 is about 4562.1719608099. The cubic root of 20813413 is about 275.0728754520.

The spelling of 20813413 in words is "twenty million, eight hundred thirteen thousand, four hundred thirteen".