20312210 has 16 divisors (see below), whose sum is σ = 36783936. Its totient is φ = 8075568.

The previous prime is 20312191. The next prime is 20312213. The reversal of 20312210 is 1221302.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20312191 and 20312200.

It is not an unprimeable number, because it can be changed into a prime (20312213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4412 + ... + 7751.

It is an arithmetic number, because the mean of its divisors is an integer number (2298996).

Almost surely, 2^20312210 is an apocalyptic number.

20312210 is a deficient number, since it is larger than the sum of its proper divisors (16471726).

20312210 is a wasteful number, since it uses less digits than its factorization.

20312210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12337.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 20312210 is about 4506.9069216038. The cubic root of 20312210 is about 272.8469222814.

Adding to 20312210 its reverse (1221302), we get a palindrome (21533512).

The spelling of 20312210 in words is "twenty million, three hundred twelve thousand, two hundred ten".