20801427529 has 9 divisors (see below), whose sum is σ = 20924891463. Its totient is φ = 20678690352.

The previous prime is 20801427527. The next prime is 20801427541. The reversal of 20801427529 is 92572410802.

The square root of 20801427529 is 144227.

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., 4224350025 + 16577077504 = 64995^2 + 128752^2 .

It is not a de Polignac number, because 20801427529 - 2¹ = 20801427527 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20801427491 and 20801427500.

It is not an unprimeable number, because it can be changed into a prime (20801427527) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 33604582 + ... + 33605200.

Almost surely, 2^20801427529 is an apocalyptic number.

20801427529 is the 144227-th square number.

20801427529 is the 72114-th centered octagonal number.

It is an amenable number.

20801427529 is a deficient number, since it is larger than the sum of its proper divisors (123463934).

20801427529 is an frugal number, since it uses more digits than its factorization.

20801427529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1704 (or 852 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 20801427529 in words is "twenty billion, eight hundred one million, four hundred twenty-seven thousand, five hundred twenty-nine".