20136521862 has 64 divisors (see below), whose sum is σ = 47642212800. Its totient is φ = 6282385920.

The previous prime is 20136521861. The next prime is 20136521887. The reversal of 20136521862 is 26812563102.

20136521862 is a `hidden beast` number, since 20 + 1 + 36 + 521 + 86 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20136521861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105564 + ... + 226752.

It is an arithmetic number, because the mean of its divisors is an integer number (744409575).

Almost surely, 2^20136521862 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20136521862, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23821106400).

20136521862 is an abundant number, since it is smaller than the sum of its proper divisors (27505690938).

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

20136521862 is a wasteful number, since it uses less digits than its factorization.

20136521862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121398 (or 121392 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 20136521862 in words is "twenty billion, one hundred thirty-six million, five hundred twenty-one thousand, eight hundred sixty-two".