20999830147 has 2 divisors, whose sum is σ = 20999830148. Its totient is φ = 20999830146.

The previous prime is 20999830129. The next prime is 20999830151. The reversal of 20999830147 is 74103899902.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20999830147 - 2¹¹ = 20999828099 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20999830094 and 20999830103.

It is not a weakly prime, because it can be changed into another prime (20999833147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10499915073 + 10499915074.

It is an arithmetic number, because the mean of its divisors is an integer number (10499915074).

Almost surely, 2^20999830147 is an apocalyptic number.

20999830147 is a deficient number, since it is larger than the sum of its proper divisors (1).

20999830147 is an equidigital number, since it uses as much as digits as its factorization.

20999830147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 20999830147 in words is "twenty billion, nine hundred ninety-nine million, eight hundred thirty thousand, one hundred forty-seven".