20861083400 has 24 divisors (see below), whose sum is σ = 48502019370. Its totient is φ = 8344433280.

The previous prime is 20861083393. The next prime is 20861083403. The reversal of 20861083400 is 438016802.

It can be written as a sum of positive squares in 3 ways, for example, as 13193279044 + 7667804356 = 114862^2 + 87566^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20861083403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52152509 + ... + 52152908.

Almost surely, 2^20861083400 is an apocalyptic number.

20861083400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20861083400 is an abundant number, since it is smaller than the sum of its proper divisors (27640935970).

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

20861083400 is a wasteful number, since it uses less digits than its factorization.

20861083400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104305433 (or 104305424 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The spelling of 20861083400 in words is "twenty billion, eight hundred sixty-one million, eighty-three thousand, four hundred".