20270390 has 16 divisors (see below), whose sum is σ = 41699232. Its totient is φ = 6949824.

The previous prime is 20270389. The next prime is 20270417. The reversal of 20270390 is 9307202.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144719 + ... + 144858.

It is an arithmetic number, because the mean of its divisors is an integer number (2606202).

Almost surely, 2^20270390 is an apocalyptic number.

20270390 is an abundant number, since it is smaller than the sum of its proper divisors (21428842).

20270390 is a wasteful number, since it uses less digits than its factorization.

20270390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289591.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 20270390 is about 4502.2649855378. The cubic root of 20270390 is about 272.6595424065.

Adding to 20270390 its reverse (9307202), we get a palindrome (29577592).

The spelling of 20270390 in words is "twenty million, two hundred seventy thousand, three hundred ninety".