20701449889 has 4 divisors (see below), whose sum is σ = 20755501056. Its totient is φ = 20647398724.

The previous prime is 20701449887. The next prime is 20701449919. The reversal of 20701449889 is 98894410702.

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 20701449889 - 2¹ = 20701449887 is a prime.

It is a super-2 number, since 2×20701449889² (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 (20701449883) 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, 27025009 + ... + 27025774.

It is an arithmetic number, because the mean of its divisors is an integer number (5188875264).

Almost surely, 2^20701449889 is an apocalyptic number.

It is an amenable number.

20701449889 is a deficient number, since it is larger than the sum of its proper divisors (54051167).

20701449889 is an equidigital number, since it uses as much as digits as its factorization.

20701449889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54051166.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 20701449889 in words is "twenty billion, seven hundred one million, four hundred forty-nine thousand, eight hundred eighty-nine".