20845393536 has 128 divisors (see below), whose sum is σ = 61544629440. Its totient is φ = 6197534720.

The previous prime is 20845393507. The next prime is 20845393537. The reversal of 20845393536 is 63539354802.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (20845393537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177316 + ... + 270428.

Almost surely, 2^20845393536 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 20845393536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30772314720).

20845393536 is an abundant number, since it is smaller than the sum of its proper divisors (40699235904).

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

20845393536 is a wasteful number, since it uses less digits than its factorization.

20845393536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93194 (or 93182 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 48.

The spelling of 20845393536 in words is "twenty billion, eight hundred forty-five million, three hundred ninety-three thousand, five hundred thirty-six".