20557662266 has 4 divisors (see below), whose sum is σ = 30836493402. Its totient is φ = 10278831132.

The previous prime is 20557662259. The next prime is 20557662317. The reversal of 20557662266 is 66226675502.

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., 17205831241 + 3351831025 = 131171^2 + 57895^2 .

It is a super-3 number, since 3×20557662266³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20557662266.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5139415565 + ... + 5139415568.

Almost surely, 2^20557662266 is an apocalyptic number.

20557662266 is a deficient number, since it is larger than the sum of its proper divisors (10278831136).

20557662266 is a wasteful number, since it uses less digits than its factorization.

20557662266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10278831135.

The product of its (nonzero) digits is 1814400, while the sum is 47.

The spelling of 20557662266 in words is "twenty billion, five hundred fifty-seven million, six hundred sixty-two thousand, two hundred sixty-six".