20939826436 has 9 divisors (see below), whose sum is σ = 36645202741. Its totient is φ = 10469768512.

The previous prime is 20939826433. The next prime is 20939826473. The reversal of 20939826436 is 63462893902.

The square root of 20939826436 is 144706.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 20331908100 + 607918336 = 142590^2 + 24656^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20939826431) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 253236 + ... + 325588.

Almost surely, 2^20939826436 is an apocalyptic number.

20939826436 is the 144706-th square number.

It is an amenable number.

20939826436 is a deficient number, since it is larger than the sum of its proper divisors (15705376305).

20939826436 is an frugal number, since it uses more digits than its factorization.

20939826436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144710 (or 72355 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 52.

The spelling of 20939826436 in words is "twenty billion, nine hundred thirty-nine million, eight hundred twenty-six thousand, four hundred thirty-six".