20980911 has 8 divisors (see below), whose sum is σ = 31970944. Its totient is φ = 11989080.

The previous prime is 20980903. The next prime is 20980913. The reversal of 20980911 is 11908902.

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

It is not a de Polignac number, because 20980911 - 2³ = 20980903 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 (20980913) 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, 499525 + ... + 499566.

It is an arithmetic number, because the mean of its divisors is an integer number (3996368).

Almost surely, 2^20980911 is an apocalyptic number.

20980911 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20980911 is a deficient number, since it is larger than the sum of its proper divisors (10990033).

20980911 is an equidigital number, since it uses as much as digits as its factorization.

20980911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999101.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 20980911 is about 4580.4924407753. The cubic root of 20980911 is about 275.8087968934.

The spelling of 20980911 in words is "twenty million, nine hundred eighty thousand, nine hundred eleven".