20806462989 has 48 divisors (see below), whose sum is σ = 33526846080. Its totient is φ = 12345782400.

The previous prime is 20806462961. The next prime is 20806463011. The reversal of 20806462989 is 98926460802.

It is a happy number.

20806462989 is a `hidden beast` number, since 2 + 0 + 8 + 0 + 6 + 4 + 629 + 8 + 9 = 666.

It is not a de Polignac number, because 20806462989 - 2⁷ = 20806462861 is a prime.

It is a super-2 number, since 2×20806462989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20806462909) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2788714 + ... + 2796164.

It is an arithmetic number, because the mean of its divisors is an integer number (698475960).

Almost surely, 2^20806462989 is an apocalyptic number.

20806462989 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20806462989 is a deficient number, since it is larger than the sum of its proper divisors (12720383091).

20806462989 is a wasteful number, since it uses less digits than its factorization.

20806462989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8322 (or 8319 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The spelling of 20806462989 in words is "twenty billion, eight hundred six million, four hundred sixty-two thousand, nine hundred eighty-nine".