20389277 has 4 divisors (see below), whose sum is σ = 20618460. Its totient is φ = 20160096.

The previous prime is 20389249. The next prime is 20389297. The reversal of 20389277 is 77298302.

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 6446521 + 13942756 = 2539^2 + 3734^2 .

It is a cyclic number.

It is not a de Polignac number, because 20389277 - 2⁸ = 20389021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20389277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20389207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114458 + ... + 114635.

It is an arithmetic number, because the mean of its divisors is an integer number (5154615).

Almost surely, 2^20389277 is an apocalyptic number.

It is an amenable number.

20389277 is a deficient number, since it is larger than the sum of its proper divisors (229183).

20389277 is an equidigital number, since it uses as much as digits as its factorization.

20389277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229182.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 20389277 is about 4515.4487041710. The cubic root of 20389277 is about 273.1915582754.

The spelling of 20389277 in words is "twenty million, three hundred eighty-nine thousand, two hundred seventy-seven".