20980919 has 2 divisors, whose sum is σ = 20980920. Its totient is φ = 20980918.

The previous prime is 20980913. The next prime is 20980943. The reversal of 20980919 is 91908902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20980919 - 2⁴ = 20980903 is a prime.

It is a super-2 number, since 2×20980919² = 880397924169122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20980913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10490459 + 10490460.

It is an arithmetic number, because the mean of its divisors is an integer number (10490460).

Almost surely, 2^20980919 is an apocalyptic number.

20980919 is a deficient number, since it is larger than the sum of its proper divisors (1).

20980919 is an equidigital number, since it uses as much as digits as its factorization.

20980919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 20980919 is about 4580.4933140438. The cubic root of 20980919 is about 275.8088319486.

The spelling of 20980919 in words is "twenty million, nine hundred eighty thousand, nine hundred nineteen".