20684231572 has 24 divisors (see below), whose sum is σ = 36613283112. Its totient is φ = 10223616000.

The previous prime is 20684231549. The next prime is 20684231593. The reversal of 20684231572 is 27513248602.

It can be written as a sum of positive squares in 4 ways, for example, as 8184097156 + 12500134416 = 90466^2 + 111804^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219028 + ... + 298900.

It is an arithmetic number, because the mean of its divisors is an integer number (1525553463).

Almost surely, 2^20684231572 is an apocalyptic number.

It is an amenable number.

20684231572 is a deficient number, since it is larger than the sum of its proper divisors (15929051540).

20684231572 is a wasteful number, since it uses less digits than its factorization.

20684231572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80619 (or 80617 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 20684231572 in words is "twenty billion, six hundred eighty-four million, two hundred thirty-one thousand, five hundred seventy-two".