20836633801 has 3 divisors (see below), whose sum is σ = 20836778151. Its totient is φ = 20836489452.

The previous prime is 20836633781. The next prime is 20836633817. The reversal of 20836633801 is 10833663802.

The square root of 20836633801 is 144349.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 12221081401 + 8615552400 = 110549^2 + 92820^2 .

It is not a de Polignac number, because 20836633801 - 2⁷ = 20836633673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20836633871) 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, 72175 + ... + 216523.

It is an arithmetic number, because the mean of its divisors is an integer number (6945592717).

Almost surely, 2^20836633801 is an apocalyptic number.

20836633801 is the 144349-th square number.

20836633801 is the 72175-th centered octagonal number.

It is an amenable number.

20836633801 is a deficient number, since it is larger than the sum of its proper divisors (144350).

20836633801 is an frugal number, since it uses more digits than its factorization.

20836633801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288698 (or 144349 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The spelling of 20836633801 in words is "twenty billion, eight hundred thirty-six million, six hundred thirty-three thousand, eight hundred one".