20612966400 has 1152 divisors, whose sum is σ = 86444467200. Its totient is φ = 4777574400.

The previous prime is 20612966399. The next prime is 20612966417. The reversal of 20612966400 is 466921602.

20612966400 is a `hidden beast` number, since 2 + 0 + 6 + 1 + 2 + 9 + 6 + 640 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1152).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 557107182 + ... + 557107218.

It is an arithmetic number, because the mean of its divisors is an integer number (75038600).

Almost surely, 2^20612966400 is an apocalyptic number.

20612966400 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 20612966400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43222233600).

20612966400 is an abundant number, since it is smaller than the sum of its proper divisors (65831500800).

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

20612966400 is a wasteful number, since it uses less digits than its factorization.

20612966400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 91 counting only the distinct ones).

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

The spelling of 20612966400 in words is "twenty billion, six hundred twelve million, nine hundred sixty-six thousand, four hundred".