20661266435 has 8 divisors (see below), whose sum is σ = 24794655360. Its totient is φ = 16528256064.

The previous prime is 20661266419. The next prime is 20661266471. The reversal of 20661266435 is 53466216602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20661266435 - 2⁴ = 20661266419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20661266392 and 20661266401.

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, 43871 + ... + 207959.

It is an arithmetic number, because the mean of its divisors is an integer number (3099331920).

Almost surely, 2^20661266435 is an apocalyptic number.

20661266435 is a deficient number, since it is larger than the sum of its proper divisors (4133388925).

20661266435 is a wasteful number, since it uses less digits than its factorization.

20661266435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189277.

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 20661266435 in words is "twenty billion, six hundred sixty-one million, two hundred sixty-six thousand, four hundred thirty-five".