20440759 has 2 divisors, whose sum is σ = 20440760. Its totient is φ = 20440758.

The previous prime is 20440753. The next prime is 20440793. The reversal of 20440759 is 95704402.

20440759 = T₃₆₉₀ + T₃₆₉₁ + T₃₆₉₂.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20440759 - 2¹¹ = 20438711 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20440759.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20440753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10220379 + 10220380.

It is an arithmetic number, because the mean of its divisors is an integer number (10220380).

Almost surely, 2^20440759 is an apocalyptic number.

20440759 is the 3692-nd centered triangular number.

20440759 is a deficient number, since it is larger than the sum of its proper divisors (1).

20440759 is an equidigital number, since it uses as much as digits as its factorization.

20440759 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20440759 is about 4521.1457618617. The cubic root of 20440759 is about 273.4212971232.

The spelling of 20440759 in words is "twenty million, four hundred forty thousand, seven hundred fifty-nine".