20049478 has 16 divisors (see below), whose sum is σ = 30517344. Its totient is φ = 9878400.

The previous prime is 20049473. The next prime is 20049493. The reversal of 20049478 is 87494002.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20049473) 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 in 7 ways as a sum of consecutive naturals, for example, 59326 + ... + 59662.

It is an arithmetic number, because the mean of its divisors is an integer number (1907334).

Almost surely, 2^20049478 is an apocalyptic number.

20049478 is a deficient number, since it is larger than the sum of its proper divisors (10467866).

20049478 is a wasteful number, since it uses less digits than its factorization.

20049478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 20049478 is about 4477.6643465092. The cubic root of 20049478 is about 271.6654172516.

The spelling of 20049478 in words is "twenty million, forty-nine thousand, four hundred seventy-eight".