20261593506 has 96 divisors (see below), whose sum is σ = 51478277760. Its totient is φ = 5203503360.

The previous prime is 20261593489. The next prime is 20261593529. The reversal of 20261593506 is 60539516202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 429900 + ... + 474696.

It is an arithmetic number, because the mean of its divisors is an integer number (536232060).

Almost surely, 2^20261593506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20261593506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25739138880).

20261593506 is an abundant number, since it is smaller than the sum of its proper divisors (31216684254).

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

20261593506 is a wasteful number, since it uses less digits than its factorization.

20261593506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44920 (or 44909 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 39.

The spelling of 20261593506 in words is "twenty billion, two hundred sixty-one million, five hundred ninety-three thousand, five hundred six".