20657143291 has 8 divisors (see below), whose sum is σ = 21402195968. Its totient is φ = 19917009000.

The previous prime is 20657143279. The next prime is 20657143321. The reversal of 20657143291 is 19234175602.

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 20657143291 - 2⁷ = 20657143163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20657143261) 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 7 ways as a sum of consecutive naturals, for example, 1221045 + ... + 1237846.

It is an arithmetic number, because the mean of its divisors is an integer number (2675274496).

Almost surely, 2^20657143291 is an apocalyptic number.

20657143291 is a deficient number, since it is larger than the sum of its proper divisors (745052677).

20657143291 is a wasteful number, since it uses less digits than its factorization.

20657143291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2459193.

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 20657143291 in words is "twenty billion, six hundred fifty-seven million, one hundred forty-three thousand, two hundred ninety-one".