20871798497 has 8 divisors (see below), whose sum is σ = 22808703072. Its totient is φ = 18941472000.

The previous prime is 20871798487. The next prime is 20871798529. The reversal of 20871798497 is 79489717802.

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

It is not a de Polignac number, because 20871798497 - 2¹² = 20871794401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20871798407) 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, 1637879 + ... + 1650572.

It is an arithmetic number, because the mean of its divisors is an integer number (2851087884).

Almost surely, 2^20871798497 is an apocalyptic number.

It is an amenable number.

20871798497 is a deficient number, since it is larger than the sum of its proper divisors (1936904575).

20871798497 is a wasteful number, since it uses less digits than its factorization.

20871798497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3289039.

The product of its (nonzero) digits is 14224896, while the sum is 62.

The spelling of 20871798497 in words is "twenty billion, eight hundred seventy-one million, seven hundred ninety-eight thousand, four hundred ninety-seven".