20509345962 has 160 divisors (see below), whose sum is σ = 56082419712. Its totient is φ = 5474389536.

The previous prime is 20509345907. The next prime is 20509345973. The reversal of 20509345962 is 26954390502.

20509345962 is a `hidden beast` number, since 2 + 0 + 50 + 9 + 3 + 4 + 596 + 2 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1112383 + ... + 1130669.

Almost surely, 2^20509345962 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20509345962, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28041209856).

20509345962 is an abundant number, since it is smaller than the sum of its proper divisors (35573073750).

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

20509345962 is a wasteful number, since it uses less digits than its factorization.

20509345962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18374 (or 18365 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

The spelling of 20509345962 in words is "twenty billion, five hundred nine million, three hundred forty-five thousand, nine hundred sixty-two".