20270289 has 16 divisors (see below), whose sum is σ = 29218112. Its totient is φ = 12426048.

The previous prime is 20270267. The next prime is 20270303. The reversal of 20270289 is 98207202.

It is not a de Polignac number, because 20270289 - 2⁷ = 20270161 is a prime.

It is a super-2 number, since 2×20270289² = 821769232287042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20270389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11127 + ... + 12819.

It is an arithmetic number, because the mean of its divisors is an integer number (1826132).

Almost surely, 2^20270289 is an apocalyptic number.

It is an amenable number.

20270289 is a deficient number, since it is larger than the sum of its proper divisors (8947823).

20270289 is a wasteful number, since it uses less digits than its factorization.

20270289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2016.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20270289 is about 4502.2537689473. The cubic root of 20270289 is about 272.6590895512.

The spelling of 20270289 in words is "twenty million, two hundred seventy thousand, two hundred eighty-nine".