20897258 has 16 divisors (see below), whose sum is σ = 32188416. Its totient is φ = 10171440.

The previous prime is 20897243. The next prime is 20897263. The reversal of 20897258 is 85279802.

It is a happy number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 11735 + ... + 13397.

It is an arithmetic number, because the mean of its divisors is an integer number (2011776).

Almost surely, 2^20897258 is an apocalyptic number.

20897258 is a deficient number, since it is larger than the sum of its proper divisors (11291158).

20897258 is a wasteful number, since it uses less digits than its factorization.

20897258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 20897258 is about 4571.3518788210. The cubic root of 20897258 is about 275.4417495146.

The spelling of 20897258 in words is "twenty million, eight hundred ninety-seven thousand, two hundred fifty-eight".