20274985 has 4 divisors (see below), whose sum is σ = 24329988. Its totient is φ = 16219984.

The previous prime is 20274979. The next prime is 20275007. The reversal of 20274985 is 58947202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13741849 + 6533136 = 3707^2 + 2556^2 .

It is a cyclic number.

It is not a de Polignac number, because 20274985 - 2⁵ = 20274953 is a prime.

It is a super-2 number, since 2×20274985² = 822150033500450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2027494 + ... + 2027503.

It is an arithmetic number, because the mean of its divisors is an integer number (6082497).

Almost surely, 2^20274985 is an apocalyptic number.

It is an amenable number.

20274985 is a deficient number, since it is larger than the sum of its proper divisors (4055003).

20274985 is an equidigital number, since it uses as much as digits as its factorization.

20274985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4055002.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 20274985 is about 4502.7752553287. The cubic root of 20274985 is about 272.6801434892.

The spelling of 20274985 in words is "twenty million, two hundred seventy-four thousand, nine hundred eighty-five".