20803290 has 32 divisors (see below), whose sum is σ = 52557120. Its totient is φ = 5255424.

The previous prime is 20803267. The next prime is 20803297. The reversal of 20803290 is 9230802.

It is a self number, because there is not a number n which added to its sum of digits gives 20803290.

It is not an unprimeable number, because it can be changed into a prime (20803297) 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, 17679 + ... + 18818.

It is an arithmetic number, because the mean of its divisors is an integer number (1642410).

Almost surely, 2^20803290 is an apocalyptic number.

20803290 is an abundant number, since it is smaller than the sum of its proper divisors (31753830).

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

20803290 is a wasteful number, since it uses less digits than its factorization.

20803290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36526.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 20803290 is about 4561.0623762453. The cubic root of 20803290 is about 275.0282725753.

The spelling of 20803290 in words is "twenty million, eight hundred three thousand, two hundred ninety".