20861825080 has 16 divisors (see below), whose sum is σ = 46939106520. Its totient is φ = 8344730016.

The previous prime is 20861825071. The next prime is 20861825087. The reversal of 20861825080 is 8052816802.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 521545627 = 20861825080 / (2 + 0 + 8 + 6 + 1 + 8 + 2 + 5 + 0 + 8 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20861825087) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 260772774 + ... + 260772853.

Almost surely, 2^20861825080 is an apocalyptic number.

20861825080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20861825080 is an abundant number, since it is smaller than the sum of its proper divisors (26077281440).

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

20861825080 is a wasteful number, since it uses less digits than its factorization.

20861825080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521545638 (or 521545634 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 40.

The spelling of 20861825080 in words is "twenty billion, eight hundred sixty-one million, eight hundred twenty-five thousand, eighty".