20189949 has 16 divisors (see below), whose sum is σ = 29085504. Its totient is φ = 12384000.

The previous prime is 20189941. The next prime is 20189969. The reversal of 20189949 is 94998102.

It is not a de Polignac number, because 20189949 - 2³ = 20189941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20189949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20189941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14994 + ... + 16284.

It is an arithmetic number, because the mean of its divisors is an integer number (1817844).

Almost surely, 2^20189949 is an apocalyptic number.

It is an amenable number.

20189949 is a deficient number, since it is larger than the sum of its proper divisors (8895555).

20189949 is a wasteful number, since it uses less digits than its factorization.

20189949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1708.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 20189949 is about 4493.3227126482. The cubic root of 20189949 is about 272.2983902800.

The spelling of 20189949 in words is "twenty million, one hundred eighty-nine thousand, nine hundred forty-nine".