20645502336 has 96 divisors (see below), whose sum is σ = 60125640120. Its totient is φ = 6798888960.

The previous prime is 20645502307. The next prime is 20645502337. The reversal of 20645502336 is 63320554602.

20645502336 is a `hidden beast` number, since 2 + 0 + 645 + 5 + 0 + 2 + 3 + 3 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20645502336.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645502337) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12345 + ... + 203576.

Almost surely, 2^20645502336 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 20645502336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30062820060).

20645502336 is an abundant number, since it is smaller than the sum of its proper divisors (39480137784).

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

20645502336 is a wasteful number, since it uses less digits than its factorization.

20645502336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216024 (or 216009 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

The spelling of 20645502336 in words is "twenty billion, six hundred forty-five million, five hundred two thousand, three hundred thirty-six".