20916870549912 has 192 divisors, whose sum is σ = 62458915034880. Its totient is φ = 6543313425792.

The previous prime is 20916870549893. The next prime is 20916870549919. The reversal of 20916870549912 is 21994507861902.

20916870549912 is a `hidden beast` number, since 2 + 0 + 9 + 1 + 6 + 8 + 70 + 549 + 9 + 12 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20916870549912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20916870549919) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2043598 + ... + 6783069.

It is an arithmetic number, because the mean of its divisors is an integer number (325306849140).

Almost surely, 2^{20916870549912} is an apocalyptic number.

It is an amenable number.

20916870549912 is an abundant number, since it is smaller than the sum of its proper divisors (41542044484968).

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

20916870549912 is a wasteful number, since it uses less digits than its factorization.

20916870549912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8826764 (or 8826748 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 63.

The spelling of 20916870549912 in words is "twenty trillion, nine hundred sixteen billion, eight hundred seventy million, five hundred forty-nine thousand, nine hundred twelve".