21237165

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^2\times {\mathrm{23}}^1\times {\mathrm{71}}^1$

素因数の和:139

約数の個数: 72

約数和(自身を含む): 41378688

約数和(自身を除く): 20141523

約数列:

[1, 3, 5, 9, 15, 17, 23, 45, 51, 69, 71, 85, 115, 153, 207, 213, 255, 289, 345, 355, 391, 639, 765, 867, 1035, 1065, 1173, 1207, 1445, 1633, 1955, 2601, 3195, 3519, 3621, 4335, 4899, 5865, 6035, 6647, 8165, 10863, 13005, 14697, 17595, 18105, 19941, 20519, 24495, 27761, 33235, 54315, 59823, 61557, 73485, 83283, 99705, 102595, 138805, 184671, 249849, 299115, 307785, 416415, 471937, 923355, 1249245, 1415811, 2359685, 4247433, 7079055, 21237165]

約数ペア:

[(1, 21237165), (3, 7079055), (5, 4247433), (9, 2359685), (15, 1415811), (17, 1249245), (23, 923355), (45, 471937), (51, 416415), (69, 307785), (71, 299115), (85, 249849), (115, 184671), (153, 138805), (207, 102595), (213, 99705), (255, 83283), (289, 73485), (345, 61557), (355, 59823), (391, 54315), (639, 33235), (765, 27761), (867, 24495), (1035, 20519), (1065, 19941), (1173, 18105), (1207, 17595), (1445, 14697), (1633, 13005), (1955, 10863), (2601, 8165), (3195, 6647), (3519, 6035), (3621, 5865), (4335, 4899)]