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20912417 is a prime number
BaseRepresentation
bin100111111000…
…1100100100001
31110100110102222
41033301210201
520323144132
62024120425
7342516101
oct117614441
943313388
1020912417
1110893899
127006115
134442816
142ac5201
151c81412
hex13f1921

20912417 has 2 divisors, whose sum is σ = 20912418. Its totient is φ = 20912416.

The previous prime is 20912377. The next prime is 20912453. The reversal of 20912417 is 71421902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19678096 + 1234321 = 4436^2 + 1111^2 .

It is a cyclic number.

It is not a de Polignac number, because 20912417 - 220 = 19863841 is a prime.

It is not a weakly prime, because it can be changed into another prime (20912477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10456208 + 10456209.

It is an arithmetic number, because the mean of its divisors is an integer number (10456209).

Almost surely, 220912417 is an apocalyptic number.

It is an amenable number.

20912417 is a deficient number, since it is larger than the sum of its proper divisors (1).

20912417 is an equidigital number, since it uses as much as digits as its factorization.

20912417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 20912417 is about 4573.0096216824. The cubic root of 20912417 is about 275.5083357985.

The spelling of 20912417 in words is "twenty million, nine hundred twelve thousand, four hundred seventeen".