20859293897 has 8 divisors (see below), whose sum is σ = 22470022344. Its totient is φ = 19249446528.

The previous prime is 20859293893. The next prime is 20859293927. The reversal of 20859293897 is 79839295802.

It can be written as a sum of positive squares in 4 ways, for example, as 1312178176 + 19547115721 = 36224^2 + 139811^2 .

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

It is not a de Polignac number, because 20859293897 - 2² = 20859293893 is a prime.

It is a super-2 number, since 2×20859293897² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20859293891) 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, 170678 + ... + 266175.

It is an arithmetic number, because the mean of its divisors is an integer number (2808752793).

Almost surely, 2^20859293897 is an apocalyptic number.

It is an amenable number.

20859293897 is a deficient number, since it is larger than the sum of its proper divisors (1610728447).

20859293897 is a wasteful number, since it uses less digits than its factorization.

20859293897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440539.

The product of its (nonzero) digits is 19595520, while the sum is 62.

The spelling of 20859293897 in words is "twenty billion, eight hundred fifty-nine million, two hundred ninety-three thousand, eight hundred ninety-seven".