20630881999 has 32 divisors (see below), whose sum is σ = 25631907840. Its totient is φ = 16169760000.

The previous prime is 20630881841. The next prime is 20630882003. The reversal of 20630881999 is 99918803602.

It is a cyclic number.

It is not a de Polignac number, because 20630881999 - 2¹⁹ = 20630357711 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20630881499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4360267 + ... + 4364995.

It is an arithmetic number, because the mean of its divisors is an integer number (800997120).

Almost surely, 2^20630881999 is an apocalyptic number.

20630881999 is a deficient number, since it is larger than the sum of its proper divisors (5001025841).

20630881999 is a wasteful number, since it uses less digits than its factorization.

20630881999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5191.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The spelling of 20630881999 in words is "twenty billion, six hundred thirty million, eight hundred eighty-one thousand, nine hundred ninety-nine".