20276818439666 has 4 divisors (see below), whose sum is σ = 30415227659502. Its totient is φ = 10138409219832.

The previous prime is 20276818439573. The next prime is 20276818439723. The reversal of 20276818439666 is 66693481867202.

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., 15858115950625 + 4418702489041 = 3982225^2 + 2102071^2 .

It is a super-2 number, since 2×20276818439666² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20276818439596 and 20276818439605.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5069204609915 + ... + 5069204609918.

Almost surely, 2^{20276818439666} is an apocalyptic number.

20276818439666 is a deficient number, since it is larger than the sum of its proper divisors (10138409219836).

20276818439666 is a wasteful number, since it uses less digits than its factorization.

20276818439666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10138409219835.

The product of its (nonzero) digits is 250822656, while the sum is 68.

The spelling of 20276818439666 in words is "twenty trillion, two hundred seventy-six billion, eight hundred eighteen million, four hundred thirty-nine thousand, six hundred sixty-six".