20088405 has 40 divisors (see below), whose sum is σ = 36337752. Its totient is φ = 10616832.

The previous prime is 20088391. The next prime is 20088427. The reversal of 20088405 is 50488002.

It can be written as a sum of positive squares in 4 ways, for example, as 4901796 + 15186609 = 2214^2 + 3897^2 .

It is not a de Polignac number, because 20088405 - 2¹⁰ = 20087381 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 39 ways as a sum of consecutive naturals, for example, 78037 + ... + 78293.

Almost surely, 2^20088405 is an apocalyptic number.

It is an amenable number.

20088405 is a deficient number, since it is larger than the sum of its proper divisors (16249347).

20088405 is a wasteful number, since it uses less digits than its factorization.

20088405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467 (or 458 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 20088405 is about 4482.0090361355. The cubic root of 20088405 is about 271.8411206297.

The spelling of 20088405 in words is "twenty million, eighty-eight thousand, four hundred five".