20740417 has 2 divisors, whose sum is σ = 20740418. Its totient is φ = 20740416.

The previous prime is 20740409. The next prime is 20740429. The reversal of 20740417 is 71404702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20061441 + 678976 = 4479^2 + 824^2 .

It is a cyclic number.

It is not a de Polignac number, because 20740417 - 2³ = 20740409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20740391 and 20740400.

It is not a weakly prime, because it can be changed into another prime (20740477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10370208 + 10370209.

It is an arithmetic number, because the mean of its divisors is an integer number (10370209).

Almost surely, 2^20740417 is an apocalyptic number.

It is an amenable number.

20740417 is a deficient number, since it is larger than the sum of its proper divisors (1).

20740417 is an equidigital number, since it uses as much as digits as its factorization.

20740417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 20740417 is about 4554.1647971939. The cubic root of 20740417 is about 274.7509237832.

The spelling of 20740417 in words is "twenty million, seven hundred forty thousand, four hundred seventeen".