20477858 has 16 divisors (see below), whose sum is σ = 32447520. Its totient is φ = 9665856.

The previous prime is 20477833. The next prime is 20477881. The reversal of 20477858 is 85877402.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12410 + ... + 13962.

It is an arithmetic number, because the mean of its divisors is an integer number (2027970).

Almost surely, 2^20477858 is an apocalyptic number.

20477858 is a deficient number, since it is larger than the sum of its proper divisors (11969662).

20477858 is a wasteful number, since it uses less digits than its factorization.

20477858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1921.

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 20477858 is about 4525.2467336047. The cubic root of 20477858 is about 273.5866126761.

The spelling of 20477858 in words is "twenty million, four hundred seventy-seven thousand, eight hundred fifty-eight".