20320353266 has 16 divisors (see below), whose sum is σ = 32606224056. Its totient is φ = 9463934976.

The previous prime is 20320353257. The next prime is 20320353281. The reversal of 20320353266 is 66235302302.

It can be written as a sum of positive squares in 4 ways, for example, as 17116227241 + 3204126025 = 130829^2 + 56605^2 .

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, 3077411 + ... + 3084006.

Almost surely, 2^20320353266 is an apocalyptic number.

20320353266 is a deficient number, since it is larger than the sum of its proper divisors (12285870790).

20320353266 is a wasteful number, since it uses less digits than its factorization.

20320353266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6161533.

The product of its (nonzero) digits is 38880, while the sum is 32.

Adding to 20320353266 its reverse (66235302302), we get a palindrome (86555655568).

The spelling of 20320353266 in words is "twenty billion, three hundred twenty million, three hundred fifty-three thousand, two hundred sixty-six".