20697146661 has 8 divisors (see below), whose sum is σ = 27974225920. Its totient is φ = 13609082592.

The previous prime is 20697146651. The next prime is 20697146663. The reversal of 20697146661 is 16664179602.

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

It is not a de Polignac number, because 20697146661 - 2⁹ = 20697146149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20697146661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20697146663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47253541 + ... + 47253978.

It is an arithmetic number, because the mean of its divisors is an integer number (3496778240).

Almost surely, 2^20697146661 is an apocalyptic number.

It is an amenable number.

20697146661 is a deficient number, since it is larger than the sum of its proper divisors (7277079259).

20697146661 is an equidigital number, since it uses as much as digits as its factorization.

20697146661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94507595.

The product of its (nonzero) digits is 653184, while the sum is 48.

The spelling of 20697146661 in words is "twenty billion, six hundred ninety-seven million, one hundred forty-six thousand, six hundred sixty-one".