20271201397 has 8 divisors (see below), whose sum is σ = 20639761560. Its totient is φ = 19903810560.

The previous prime is 20271201389. The next prime is 20271201439. The reversal of 20271201397 is 79310217202.

It can be written as a sum of positive squares in 4 ways, for example, as 2398452676 + 17872748721 = 48974^2 + 133689^2 .

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 20271201397 - 2³ = 20271201389 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 (20271201337) 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, 257308 + ... + 326725.

It is an arithmetic number, because the mean of its divisors is an integer number (2579970195).

Almost surely, 2^20271201397 is an apocalyptic number.

It is an amenable number.

20271201397 is a deficient number, since it is larger than the sum of its proper divisors (368560163).

20271201397 is an equidigital number, since it uses as much as digits as its factorization.

20271201397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584663.

The product of its (nonzero) digits is 10584, while the sum is 34.

Adding to 20271201397 its reverse (79310217202), we get a palindrome (99581418599).

The spelling of 20271201397 in words is "twenty billion, two hundred seventy-one million, two hundred one thousand, three hundred ninety-seven".