20475290 has 32 divisors (see below), whose sum is σ = 41959296. Its totient is φ = 7120960.

The previous prime is 20475289. The next prime is 20475311. The reversal of 20475290 is 9257402.

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 15 ways as a sum of consecutive naturals, for example, 1517 + ... + 6576.

It is an arithmetic number, because the mean of its divisors is an integer number (1311228).

Almost surely, 2^20475290 is an apocalyptic number.

20475290 is an abundant number, since it is smaller than the sum of its proper divisors (21484006).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20475290 is a wasteful number, since it uses less digits than its factorization.

20475290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8134.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20475290 is about 4524.9629832740. The cubic root of 20475290 is about 273.5751759365.

It can be divided in two parts, 2047 and 5290, that added together give a palindrome (7337).

The spelling of 20475290 in words is "twenty million, four hundred seventy-five thousand, two hundred ninety".