20213005 has 4 divisors (see below), whose sum is σ = 24255612. Its totient is φ = 16170400.

The previous prime is 20212991. The next prime is 20213047. The reversal of 20213005 is 50031202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2748964 + 17464041 = 1658^2 + 4179^2 .

It is not a de Polignac number, because 20213005 - 2¹³ = 20204813 is a prime.

It is a super-2 number, since 2×20213005² = 817131142260050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2021296 + ... + 2021305.

It is an arithmetic number, because the mean of its divisors is an integer number (6063903).

Almost surely, 2^20213005 is an apocalyptic number.

It is an amenable number.

20213005 is a deficient number, since it is larger than the sum of its proper divisors (4042607).

20213005 is an equidigital number, since it uses as much as digits as its factorization.

20213005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4042606.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 20213005 is about 4495.8875653201. The cubic root of 20213005 is about 272.4020016269.

Adding to 20213005 its reverse (50031202), we get a palindrome (70244207).

The spelling of 20213005 in words is "twenty million, two hundred thirteen thousand, five".