20005210 has 8 divisors (see below), whose sum is σ = 36009396. Its totient is φ = 8002080.

The previous prime is 20005207. The next prime is 20005213. The reversal of 20005210 is 1250002.

It is an interprime number because it is at equal distance from previous prime (20005207) and next prime (20005213).

It can be written as a sum of positive squares in 2 ways, for example, as 16556761 + 3448449 = 4069^2 + 1857^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (10), and also a Moran number because the ratio is a prime number: 2000521 = 20005210 / (2 + 0 + 0 + 0 + 5 + 2 + 1 + 0).

It is not an unprimeable number, because it can be changed into a prime (20005213) 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, 1000251 + ... + 1000270.

Almost surely, 2^20005210 is an apocalyptic number.

20005210 is a deficient number, since it is larger than the sum of its proper divisors (16004186).

20005210 is a wasteful number, since it uses less digits than its factorization.

20005210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000528.

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 20005210 is about 4472.7184127776. The cubic root of 20005210 is about 271.4653298061.

Adding to 20005210 its reverse (1250002), we get a palindrome (21255212).

The spelling of 20005210 in words is "twenty million, five thousand, two hundred ten".