20666220435 has 48 divisors (see below), whose sum is σ = 40953579264. Its totient is φ = 9444004416.

The previous prime is 20666220431. The next prime is 20666220461. The reversal of 20666220435 is 53402266602.

It is not a de Polignac number, because 20666220435 - 2² = 20666220431 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20666220435.

It is not an unprimeable number, because it can be changed into a prime (20666220431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 998704 + ... + 1019186.

It is an arithmetic number, because the mean of its divisors is an integer number (853199568).

Almost surely, 2^20666220435 is an apocalyptic number.

20666220435 is a deficient number, since it is larger than the sum of its proper divisors (20287358829).

20666220435 is a wasteful number, since it uses less digits than its factorization.

20666220435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23704 (or 23701 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The spelling of 20666220435 in words is "twenty billion, six hundred sixty-six million, two hundred twenty thousand, four hundred thirty-five".