20959507476 has 144 divisors (see below), whose sum is σ = 54533606400. Its totient is φ = 6785856000.

The previous prime is 20959507447. The next prime is 20959507477. The reversal of 20959507476 is 67470595902.

20959507476 is a `hidden beast` number, since 2 + 0 + 9 + 595 + 0 + 7 + 47 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20959507477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 77341221 + ... + 77341491.

It is an arithmetic number, because the mean of its divisors is an integer number (378705600).

Almost surely, 2^20959507476 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20959507476, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27266803200).

20959507476 is an abundant number, since it is smaller than the sum of its proper divisors (33574098924).

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

20959507476 is a wasteful number, since it uses less digits than its factorization.

20959507476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710 (or 705 counting only the distinct ones).

The product of its (nonzero) digits is 4762800, while the sum is 54.

The spelling of 20959507476 in words is "twenty billion, nine hundred fifty-nine million, five hundred seven thousand, four hundred seventy-six".