20726290 has 64 divisors (see below), whose sum is σ = 42900480. Its totient is φ = 7153920.

The previous prime is 20726269. The next prime is 20726291. The reversal of 20726290 is 9262702.

It is not an unprimeable number, because it can be changed into a prime (20726291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149041 + ... + 149179.

It is an arithmetic number, because the mean of its divisors is an integer number (670320).

Almost surely, 2^20726290 is an apocalyptic number.

20726290 is an abundant number, since it is smaller than the sum of its proper divisors (22174190).

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

20726290 is a wasteful number, since it uses less digits than its factorization.

20726290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20726290 is about 4552.6135351027. The cubic root of 20726290 is about 274.6885288968.

Adding to 20726290 its reverse (9262702), we get a palindrome (29988992).

The spelling of 20726290 in words is "twenty million, seven hundred twenty-six thousand, two hundred ninety".