20405882 has 32 divisors (see below), whose sum is σ = 37521792. Its totient is φ = 8123904.

The previous prime is 20405873. The next prime is 20405893. The reversal of 20405882 is 28850402.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19238 + ... + 20270.

It is an arithmetic number, because the mean of its divisors is an integer number (1172556).

Almost surely, 2^20405882 is an apocalyptic number.

20405882 is a deficient number, since it is larger than the sum of its proper divisors (17115910).

20405882 is a wasteful number, since it uses less digits than its factorization.

20405882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142.

The product of its (nonzero) digits is 5120, while the sum is 29.

The square root of 20405882 is about 4517.2870176689. The cubic root of 20405882 is about 273.2657004322.

The spelling of 20405882 in words is "twenty million, four hundred five thousand, eight hundred eighty-two".