20274665 has 4 divisors (see below), whose sum is σ = 24329604. Its totient is φ = 16219728.

The previous prime is 20274647. The next prime is 20274677. The reversal of 20274665 is 56647202.

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 6046681 + 14227984 = 2459^2 + 3772^2 .

It is a cyclic number.

It is not a de Polignac number, because 20274665 - 2⁶ = 20274601 is a prime.

It is a super-2 number, since 2×20274665² = 822124081724450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon 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, 2027462 + ... + 2027471.

It is an arithmetic number, because the mean of its divisors is an integer number (6082401).

Almost surely, 2^20274665 is an apocalyptic number.

It is an amenable number.

20274665 is a deficient number, since it is larger than the sum of its proper divisors (4054939).

20274665 is an equidigital number, since it uses as much as digits as its factorization.

20274665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4054938.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 20274665 is about 4502.7397215473. The cubic root of 20274665 is about 272.6787089118.

The spelling of 20274665 in words is "twenty million, two hundred seventy-four thousand, six hundred sixty-five".