20662947397 has 8 divisors (see below), whose sum is σ = 20750912000. Its totient is φ = 20575147824.

The previous prime is 20662947379. The next prime is 20662947401. The reversal of 20662947397 is 79374926602.

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 20662947397 - 2⁷ = 20662947269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20662947307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213004 + ... + 294442.

It is an arithmetic number, because the mean of its divisors is an integer number (2593864000).

Almost surely, 2^20662947397 is an apocalyptic number.

It is an amenable number.

20662947397 is a deficient number, since it is larger than the sum of its proper divisors (87964603).

20662947397 is an equidigital number, since it uses as much as digits as its factorization.

20662947397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82515.

The product of its (nonzero) digits is 6858432, while the sum is 55.

The spelling of 20662947397 in words is "twenty billion, six hundred sixty-two million, nine hundred forty-seven thousand, three hundred ninety-seven".