20189992 has 8 divisors (see below), whose sum is σ = 37856250. Its totient is φ = 10094992.

The previous prime is 20189971. The next prime is 20190013. The reversal of 20189992 is 29998102.

It is an interprime number because it is at equal distance from previous prime (20189971) and next prime (20190013).

It can be written as a sum of positive squares in only one way, i.e., 11930116 + 8259876 = 3454^2 + 2874^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1261867 + ... + 1261882.

Almost surely, 2^20189992 is an apocalyptic number.

It is an amenable number.

20189992 is a deficient number, since it is larger than the sum of its proper divisors (17666258).

20189992 is a wasteful number, since it uses less digits than its factorization.

20189992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2523755 (or 2523751 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 20189992 is about 4493.3274975234. The cubic root of 20189992 is about 272.2985835911.

The spelling of 20189992 in words is "twenty million, one hundred eighty-nine thousand, nine hundred ninety-two".