20860453689 has 4 divisors (see below), whose sum is σ = 27813938256. Its totient is φ = 13906969124.

The previous prime is 20860453651. The next prime is 20860453693. The reversal of 20860453689 is 98635406802.

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 a de Polignac number, because none of the positive numbers 2^k-20860453689 is a prime.

It is a super-2 number, since 2×20860453689² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20860453639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3476742279 + ... + 3476742284.

It is an arithmetic number, because the mean of its divisors is an integer number (6953484564).

Almost surely, 2^20860453689 is an apocalyptic number.

It is an amenable number.

20860453689 is a deficient number, since it is larger than the sum of its proper divisors (6953484567).

20860453689 is an equidigital number, since it uses as much as digits as its factorization.

20860453689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6953484566.

The product of its (nonzero) digits is 2488320, while the sum is 51.

The spelling of 20860453689 in words is "twenty billion, eight hundred sixty million, four hundred fifty-three thousand, six hundred eighty-nine".