20999950 has 12 divisors (see below), whose sum is σ = 39060000. Its totient is φ = 8399960.

The previous prime is 20999941. The next prime is 20999977. The reversal of 20999950 is 5999902.

It is a junction number, because it is equal to n+sod(n) for n = 20999897 and 20999906.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 209950 + ... + 210049.

It is an arithmetic number, because the mean of its divisors is an integer number (3255000).

Almost surely, 2^20999950 is an apocalyptic number.

20999950 is a deficient number, since it is larger than the sum of its proper divisors (18060050).

20999950 is a wasteful number, since it uses less digits than its factorization.

20999950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420011 (or 420006 counting only the distinct ones).

The product of its (nonzero) digits is 65610, while the sum is 43.

The square root of 20999950 is about 4582.5702395053. The cubic root of 20999950 is about 275.8921986757.

The spelling of 20999950 in words is "twenty million, nine hundred ninety-nine thousand, nine hundred fifty".