20769587897 has 4 divisors (see below), whose sum is σ = 21062117376. Its totient is φ = 20477058420.

The previous prime is 20769587851. The next prime is 20769587921. The reversal of 20769587897 is 79878596702.

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 20769587897 - 2¹² = 20769583801 is a prime.

It is a super-2 number, since 2×20769587897² (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 (20769587197) 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, 146264633 + ... + 146264774.

It is an arithmetic number, because the mean of its divisors is an integer number (5265529344).

Almost surely, 2^20769587897 is an apocalyptic number.

It is an amenable number.

20769587897 is a deficient number, since it is larger than the sum of its proper divisors (292529479).

20769587897 is an equidigital number, since it uses as much as digits as its factorization.

20769587897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292529478.

The product of its (nonzero) digits is 106686720, while the sum is 68.

It can be divided in two parts, 207695 and 87897, that added together give a palindrome (295592).

The spelling of 20769587897 in words is "twenty billion, seven hundred sixty-nine million, five hundred eighty-seven thousand, eight hundred ninety-seven".