20557274 has 16 divisors (see below), whose sum is σ = 32060448. Its totient is φ = 9877392.

The previous prime is 20557241. The next prime is 20557279. The reversal of 20557274 is 47275502.

It is a super-2 number, since 2×20557274² = 845203028622152, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20557274.

It is not an unprimeable number, because it can be changed into a prime (20557279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4469 + ... + 7815.

It is an arithmetic number, because the mean of its divisors is an integer number (2003778).

Almost surely, 2^20557274 is an apocalyptic number.

20557274 is a deficient number, since it is larger than the sum of its proper divisors (11503174).

20557274 is a wasteful number, since it uses less digits than its factorization.

20557274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3469.

The product of its (nonzero) digits is 19600, while the sum is 32.

The square root of 20557274 is about 4534.0130127736. The cubic root of 20557274 is about 273.9398255269.

The spelling of 20557274 in words is "twenty million, five hundred fifty-seven thousand, two hundred seventy-four".