20888290 has 8 divisors (see below), whose sum is σ = 37598940. Its totient is φ = 8355312.

The previous prime is 20888281. The next prime is 20888299. The reversal of 20888290 is 9288802.

It is an interprime number because it is at equal distance from previous prime (20888281) and next prime (20888299).

It can be written as a sum of positive squares in 2 ways, for example, as 19474569 + 1413721 = 4413^2 + 1189^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20888299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1044405 + ... + 1044424.

Almost surely, 2^20888290 is an apocalyptic number.

20888290 is a deficient number, since it is larger than the sum of its proper divisors (16710650).

20888290 is a wasteful number, since it uses less digits than its factorization.

20888290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2088836.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 20888290 is about 4570.3708821057. The cubic root of 20888290 is about 275.4023421906.

The spelling of 20888290 in words is "twenty million, eight hundred eighty-eight thousand, two hundred ninety".