20999153044 has 6 divisors (see below), whose sum is σ = 36748517834. Its totient is φ = 10499576520.

The previous prime is 20999153041. The next prime is 20999153047. The reversal of 20999153044 is 44035199902.

It is an interprime number because it is at equal distance from previous prime (20999153041) and next prime (20999153047).

It can be written as a sum of positive squares in only one way, i.e., 13423539600 + 7575613444 = 115860^2 + 87038^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20999152985 and 20999153003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20999153041) 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 as a sum of consecutive naturals, namely, 2624894127 + ... + 2624894134.

Almost surely, 2^20999153044 is an apocalyptic number.

It is an amenable number.

20999153044 is a deficient number, since it is larger than the sum of its proper divisors (15749364790).

20999153044 is a wasteful number, since it uses less digits than its factorization.

20999153044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5249788265 (or 5249788263 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 46.

The spelling of 20999153044 in words is "twenty billion, nine hundred ninety-nine million, one hundred fifty-three thousand, forty-four".