20474985 has 16 divisors (see below), whose sum is σ = 33068736. Its totient is φ = 10817088.

The previous prime is 20474969. The next prime is 20475001. The reversal of 20474985 is 58947402.

It is an interprime number because it is at equal distance from previous prime (20474969) and next prime (20475001).

It is not a de Polignac number, because 20474985 - 2⁴ = 20474969 is a prime.

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, 4774 + ... + 7983.

It is an arithmetic number, because the mean of its divisors is an integer number (2066796).

Almost surely, 2^20474985 is an apocalyptic number.

It is an amenable number.

20474985 is a deficient number, since it is larger than the sum of its proper divisors (12593751).

20474985 is a wasteful number, since it uses less digits than its factorization.

20474985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12872.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 20474985 is about 4524.9292812153. The cubic root of 20474985 is about 273.5738175374.

The spelling of 20474985 in words is "twenty million, four hundred seventy-four thousand, nine hundred eighty-five".