20840380297 has 4 divisors (see below), whose sum is σ = 22734960336. Its totient is φ = 18945800260.

The previous prime is 20840380289. The next prime is 20840380303. The reversal of 20840380297 is 79208304802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20840380297 - 2³ = 20840380289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20840380207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 947290003 + ... + 947290024.

It is an arithmetic number, because the mean of its divisors is an integer number (5683740084).

Almost surely, 2^20840380297 is an apocalyptic number.

It is an amenable number.

20840380297 is a deficient number, since it is larger than the sum of its proper divisors (1894580039).

20840380297 is a wasteful number, since it uses less digits than its factorization.

20840380297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1894580038.

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 20840380297 in words is "twenty billion, eight hundred forty million, three hundred eighty thousand, two hundred ninety-seven".