20726489 has 4 divisors (see below), whose sum is σ = 23687424. Its totient is φ = 17765556.

The previous prime is 20726479. The next prime is 20726501. The reversal of 20726489 is 98462702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20726489 - 2¹⁶ = 20660953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20726479) 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, 1480457 + ... + 1480470.

It is an arithmetic number, because the mean of its divisors is an integer number (5921856).

Almost surely, 2^20726489 is an apocalyptic number.

It is an amenable number.

20726489 is a deficient number, since it is larger than the sum of its proper divisors (2960935).

20726489 is an equidigital number, since it uses as much as digits as its factorization.

20726489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2960934.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 20726489 is about 4552.6353906282. The cubic root of 20726489 is about 274.6894080193.

The spelling of 20726489 in words is "twenty million, seven hundred twenty-six thousand, four hundred eighty-nine".