20285719 has 2 divisors, whose sum is σ = 20285720. Its totient is φ = 20285718.

The previous prime is 20285677. The next prime is 20285729. The reversal of 20285719 is 91758202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20285719 - 2¹¹ = 20283671 is a prime.

It is a super-2 number, since 2×20285719² = 823020790693922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20285729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10142859 + 10142860.

It is an arithmetic number, because the mean of its divisors is an integer number (10142860).

Almost surely, 2^20285719 is an apocalyptic number.

20285719 is a deficient number, since it is larger than the sum of its proper divisors (1).

20285719 is an equidigital number, since it uses as much as digits as its factorization.

20285719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 20285719 is about 4503.9670291866. The cubic root of 20285719 is about 272.7282558517.

The spelling of 20285719 in words is "twenty million, two hundred eighty-five thousand, seven hundred nineteen".