20930918400 has 1080 divisors, whose sum is σ = 91056125160. Its totient is φ = 4737761280.

The previous prime is 20930918399. The next prime is 20930918401. The reversal of 20930918400 is 481903902.

20930918400 is a `hidden beast` number, since 209 + 30 + 9 + 18 + 400 = 666.

It is an interprime number because it is at equal distance from previous prime (20930918399) and next prime (20930918401).

It is a tau number, because it is divible by the number of its divisors (1080).

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 (20930918401) by changing a digit.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 203212749 + ... + 203212851.

It is an arithmetic number, because the mean of its divisors is an integer number (84311227).

Almost surely, 2^20930918400 is an apocalyptic number.

20930918400 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 20930918400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45528062580).

20930918400 is an abundant number, since it is smaller than the sum of its proper divisors (70125206760).

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

20930918400 is a wasteful number, since it uses less digits than its factorization.

20930918400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 20930918400 in words is "twenty billion, nine hundred thirty million, nine hundred eighteen thousand, four hundred".