20490911 has 8 divisors (see below), whose sum is σ = 24650880. Its totient is φ = 16639128.

The previous prime is 20490839. The next prime is 20490917. The reversal of 20490911 is 11909402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20490911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20490917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76901 + ... + 77166.

It is an arithmetic number, because the mean of its divisors is an integer number (3081360).

Almost surely, 2^20490911 is an apocalyptic number.

20490911 is a deficient number, since it is larger than the sum of its proper divisors (4159969).

20490911 is a wasteful number, since it uses less digits than its factorization.

20490911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154093.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 20490911 is about 4526.6887456506. The cubic root of 20490911 is about 273.6447302057.

The spelling of 20490911 in words is "twenty million, four hundred ninety thousand, nine hundred eleven".