20363918400 has 420 divisors, whose sum is σ = 85549687168. Its totient is φ = 4654402560.

The previous prime is 20363918387. The next prime is 20363918489. The reversal of 20363918400 is 481936302.

20363918400 is a `hidden beast` number, since 2 + 0 + 3 + 639 + 18 + 4 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (420).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 895977 + ... + 918423.

Almost surely, 2^20363918400 is an apocalyptic number.

20363918400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20363918400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42774843584).

20363918400 is an abundant number, since it is smaller than the sum of its proper divisors (65185768768).

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

20363918400 is a wasteful number, since it uses less digits than its factorization.

20363918400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22488 (or 22464 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 20363918400 in words is "twenty billion, three hundred sixty-three million, nine hundred eighteen thousand, four hundred".