20021300100 has 54 divisors (see below), whose sum is σ = 62755655690. Its totient is φ = 5339013120.

The previous prime is 20021300083. The next prime is 20021300119. The reversal of 20021300100 is 100312002.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 248440644 + 19772859456 = 15762^2 + 140616^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11122045 + ... + 11123844.

Almost surely, 2^20021300100 is an apocalyptic number.

20021300100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021300100 is an abundant number, since it is smaller than the sum of its proper divisors (42734355590).

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

20021300100 is a wasteful number, since it uses less digits than its factorization.

20021300100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22245909 (or 22245899 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 20021300100 its reverse (100312002), we get a palindrome (20121612102).

The spelling of 20021300100 in words is "twenty billion, twenty-one million, three hundred thousand, one hundred".