20021312 has 28 divisors (see below), whose sum is σ = 39898320. Its totient is φ = 9968256.

The previous prime is 20021311. The next prime is 20021321. The reversal of 20021312 is 21312002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20021293 and 20021302.

It is not an unprimeable number, because it can be changed into a prime (20021311) 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, 19139 + ... + 20157.

It is an arithmetic number, because the mean of its divisors is an integer number (1424940).

Almost surely, 2^20021312 is an apocalyptic number.

It is an amenable number.

20021312 is a deficient number, since it is larger than the sum of its proper divisors (19877008).

20021312 is a wasteful number, since it uses less digits than its factorization.

20021312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338 (or 1328 counting only the distinct ones).

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

The square root of 20021312 is about 4474.5180746087. The cubic root of 20021312 is about 271.5381435465.

Adding to 20021312 its reverse (21312002), we get a palindrome (41333314).

It can be divided in two parts, 200 and 21312, that added together give a palindrome (21512).

The spelling of 20021312 in words is "twenty million, twenty-one thousand, three hundred twelve".