20678821800 has 192 divisors, whose sum is σ = 78897866880. Its totient is φ = 4362992640.

The previous prime is 20678821747. The next prime is 20678821829. The reversal of 20678821800 is 812887602.

It is a super-2 number, since 2×20678821800² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 134767 + ... + 243966.

It is an arithmetic number, because the mean of its divisors is an integer number (410926390).

Almost surely, 2^20678821800 is an apocalyptic number.

20678821800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20678821800 is an abundant number, since it is smaller than the sum of its proper divisors (58219045080).

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

20678821800 is a wasteful number, since it uses less digits than its factorization.

20678821800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378772 (or 378763 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 42.

The spelling of 20678821800 in words is "twenty billion, six hundred seventy-eight million, eight hundred twenty-one thousand, eight hundred".