20021300 has 36 divisors (see below), whose sum is σ = 46791276. Its totient is φ = 7392000.

The previous prime is 20021299. The next prime is 20021303. The reversal of 20021300 is 312002.

It can be written as a sum of positive squares in 6 ways, for example, as 4624 + 20016676 = 68^2 + 4474^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6401 + ... + 9000.

Almost surely, 2^20021300 is an apocalyptic number.

20021300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021300 is an abundant number, since it is smaller than the sum of its proper divisors (26769976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20021300 is a wasteful number, since it uses less digits than its factorization.

20021300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15428 (or 15421 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 20021300 is about 4474.5167336820. The cubic root of 20021300 is about 271.5380892967.

Adding to 20021300 its reverse (312002), we get a palindrome (20333302).

The spelling of 20021300 in words is "twenty million, twenty-one thousand, three hundred".