20021340852 has 36 divisors (see below), whose sum is σ = 50678611620. Its totient is φ = 6664666752.

The previous prime is 20021340751. The next prime is 20021340881. The reversal of 20021340852 is 25804312002.

20021340852 is a `hidden beast` number, since 200 + 2 + 1 + 3 + 408 + 52 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17501702436 + 2519638416 = 132294^2 + 50196^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 352977 + ... + 405752.

Almost surely, 2^20021340852 is an apocalyptic number.

It is an amenable number.

20021340852 is an abundant number, since it is smaller than the sum of its proper divisors (30657270768).

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

20021340852 is a wasteful number, since it uses less digits than its factorization.

20021340852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759472 (or 759467 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 20021340852 its reverse (25804312002), we get a palindrome (45825652854).

The spelling of 20021340852 in words is "twenty billion, twenty-one million, three hundred forty thousand, eight hundred fifty-two".