20402372266 has 4 divisors (see below), whose sum is σ = 30603558402. Its totient is φ = 10201186132.

The previous prime is 20402372261. The next prime is 20402372281. The reversal of 20402372266 is 66227320402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17018507025 + 3383865241 = 130455^2 + 58171^2 .

It is not an unprimeable number, because it can be changed into a prime (20402372261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5100593065 + ... + 5100593068.

Almost surely, 2^20402372266 is an apocalyptic number.

20402372266 is a deficient number, since it is larger than the sum of its proper divisors (10201186136).

20402372266 is a wasteful number, since it uses less digits than its factorization.

20402372266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10201186135.

The product of its (nonzero) digits is 48384, while the sum is 34.

Adding to 20402372266 its reverse (66227320402), we get a palindrome (86629692668).

The spelling of 20402372266 in words is "twenty billion, four hundred two million, three hundred seventy-two thousand, two hundred sixty-six".