20397432497 has 8 divisors (see below), whose sum is σ = 22294324416. Its totient is φ = 18547377552.

The previous prime is 20397432481. The next prime is 20397432499. The reversal of 20397432497 is 79423479302.

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 20397432497 - 2⁴ = 20397432481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20397432499) 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, 11708333 + ... + 11710074.

It is an arithmetic number, because the mean of its divisors is an integer number (2786790552).

Almost surely, 2^20397432497 is an apocalyptic number.

It is an amenable number.

20397432497 is a deficient number, since it is larger than the sum of its proper divisors (1896891919).

20397432497 is a wasteful number, since it uses less digits than its factorization.

20397432497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23418487.

The product of its (nonzero) digits is 2286144, while the sum is 50.

The spelling of 20397432497 in words is "twenty billion, three hundred ninety-seven million, four hundred thirty-two thousand, four hundred ninety-seven".