20910919 has 2 divisors, whose sum is σ = 20910920. Its totient is φ = 20910918.

The previous prime is 20910913. The next prime is 20910941. The reversal of 20910919 is 91901902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20910919 - 2¹⁹ = 20386631 is a prime.

It is a super-2 number, since 2×20910919² = 874533066849122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20910913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10455459 + 10455460.

It is an arithmetic number, because the mean of its divisors is an integer number (10455460).

Almost surely, 2^20910919 is an apocalyptic number.

20910919 is a deficient number, since it is larger than the sum of its proper divisors (1).

20910919 is an equidigital number, since it uses as much as digits as its factorization.

20910919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 20910919 is about 4572.8458316458. The cubic root of 20910919 is about 275.5017572294.

The spelling of 20910919 in words is "twenty million, nine hundred ten thousand, nine hundred nineteen".