20208866400 has 108 divisors (see below), whose sum is σ = 71261540532. Its totient is φ = 5389029120.

The previous prime is 20208866383. The next prime is 20208866401. The reversal of 20208866400 is 466880202.

20208866400 is a `hidden beast` number, since 2 + 0 + 2 + 0 + 8 + 8 + 6 + 640 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20208866401) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1396194 + ... + 1410593.

It is an arithmetic number, because the mean of its divisors is an integer number (659829079).

Almost surely, 2^20208866400 is an apocalyptic number.

20208866400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20208866400 is an abundant number, since it is smaller than the sum of its proper divisors (51052674132).

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

20208866400 is a wasteful number, since it uses less digits than its factorization.

20208866400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2806813 (or 2806797 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The spelling of 20208866400 in words is "twenty billion, two hundred eight million, eight hundred sixty-six thousand, four hundred".