20447589811 has 8 divisors (see below), whose sum is σ = 22399022448. Its totient is φ = 18511584000.

The previous prime is 20447589781. The next prime is 20447589839. The reversal of 20447589811 is 11898574402.

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 20447589811 - 2¹¹ = 20447587763 is a prime.

It is a super-2 number, since 2×20447589811² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20447589871) 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, 3853930 + ... + 3859231.

It is an arithmetic number, because the mean of its divisors is an integer number (2799877806).

Almost surely, 2^20447589811 is an apocalyptic number.

20447589811 is a deficient number, since it is larger than the sum of its proper divisors (1951432637).

20447589811 is a wasteful number, since it uses less digits than its factorization.

20447589811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7713413.

The product of its (nonzero) digits is 645120, while the sum is 49.

The spelling of 20447589811 in words is "twenty billion, four hundred forty-seven million, five hundred eighty-nine thousand, eight hundred eleven".