20668590123436 has 6 divisors (see below), whose sum is σ = 36170032716020. Its totient is φ = 10334295061716.

The previous prime is 20668590123431. The next prime is 20668590123479. The reversal of 20668590123436 is 63432109586602.

It is not an unprimeable number, because it can be changed into a prime (20668590123431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2583573765426 + ... + 2583573765433.

Almost surely, 2^{20668590123436} is an apocalyptic number.

It is an amenable number.

20668590123436 is a deficient number, since it is larger than the sum of its proper divisors (15501442592584).

20668590123436 is a wasteful number, since it uses less digits than its factorization.

20668590123436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5167147530863 (or 5167147530861 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 55.

The spelling of 20668590123436 in words is "twenty trillion, six hundred sixty-eight billion, five hundred ninety million, one hundred twenty-three thousand, four hundred thirty-six".