20479986 has 32 divisors (see below), whose sum is σ = 47908800. Its totient is φ = 6467040.

The previous prime is 20479937. The next prime is 20479999. The reversal of 20479986 is 68997402.

It is a happy number.

It is a Curzon number.

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, 8955 + ... + 11006.

It is an arithmetic number, because the mean of its divisors is an integer number (1497150).

Almost surely, 2^20479986 is an apocalyptic number.

20479986 is an abundant number, since it is smaller than the sum of its proper divisors (27428814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20479986 is a wasteful number, since it uses less digits than its factorization.

20479986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19991 (or 19985 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 20479986 is about 4525.4818527976. The cubic root of 20479986 is about 273.5960891254.

The spelling of 20479986 in words is "twenty million, four hundred seventy-nine thousand, nine hundred eighty-six".