20148889 has 2 divisors, whose sum is σ = 20148890. Its totient is φ = 20148888.

The previous prime is 20148883. The next prime is 20148899. The reversal of 20148889 is 98884102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17572864 + 2576025 = 4192^2 + 1605^2 .

It is a cyclic number.

It is not a de Polignac number, because 20148889 - 2⁵ = 20148857 is a prime.

It is not a weakly prime, because it can be changed into another prime (20148883) 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 as a sum of consecutive naturals, namely, 10074444 + 10074445.

It is an arithmetic number, because the mean of its divisors is an integer number (10074445).

Almost surely, 2^20148889 is an apocalyptic number.

It is an amenable number.

20148889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20148889 is an equidigital number, since it uses as much as digits as its factorization.

20148889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 20148889 is about 4488.7513854078. The cubic root of 20148889 is about 272.1136752727.

The spelling of 20148889 in words is "twenty million, one hundred forty-eight thousand, eight hundred eighty-nine".