21904415

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{461}}^1$

素因数の和:539

約数の個数: 32

約数和(自身を含む): 30735936

約数和(自身を除く): 8831521

約数列:

[1, 5, 13, 17, 43, 65, 85, 215, 221, 461, 559, 731, 1105, 2305, 2795, 3655, 5993, 7837, 9503, 19823, 29965, 39185, 47515, 99115, 101881, 257699, 336991, 509405, 1288495, 1684955, 4380883, 21904415]

約数ペア:

[(1, 21904415), (5, 4380883), (13, 1684955), (17, 1288495), (43, 509405), (65, 336991), (85, 257699), (215, 101881), (221, 99115), (461, 47515), (559, 39185), (731, 29965), (1105, 19823), (2305, 9503), (2795, 7837), (3655, 5993)]