20881402100 has 36 divisors (see below), whose sum is σ = 48798233484. Its totient is φ = 7710055680.

The previous prime is 20881402093. The next prime is 20881402151. The reversal of 20881402100 is 120418802.

It can be written as a sum of positive squares in 6 ways, for example, as 4140665104 + 16740736996 = 64348^2 + 129386^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 20881402100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8030009 + ... + 8032608.

Almost surely, 2^20881402100 is an apocalyptic number.

20881402100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20881402100 is an abundant number, since it is smaller than the sum of its proper divisors (27916831384).

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

20881402100 is a wasteful number, since it uses less digits than its factorization.

20881402100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16062644 (or 16062637 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The spelling of 20881402100 in words is "twenty billion, eight hundred eighty-one million, four hundred two thousand, one hundred".