21687920

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{431}}^1$

素因数の和:498

約数の個数: 80

約数和(自身を含む): 54960768

約数和(自身を除く): 33272848

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 37, 40, 68, 74, 80, 85, 136, 148, 170, 185, 272, 296, 340, 370, 431, 592, 629, 680, 740, 862, 1258, 1360, 1480, 1724, 2155, 2516, 2960, 3145, 3448, 4310, 5032, 6290, 6896, 7327, 8620, 10064, 12580, 14654, 15947, 17240, 25160, 29308, 31894, 34480, 36635, 50320, 58616, 63788, 73270, 79735, 117232, 127576, 146540, 159470, 255152, 271099, 293080, 318940, 542198, 586160, 637880, 1084396, 1275760, 1355495, 2168792, 2710990, 4337584, 5421980, 10843960, 21687920]

約数ペア:

[(1, 21687920), (2, 10843960), (4, 5421980), (5, 4337584), (8, 2710990), (10, 2168792), (16, 1355495), (17, 1275760), (20, 1084396), (34, 637880), (37, 586160), (40, 542198), (68, 318940), (74, 293080), (80, 271099), (85, 255152), (136, 159470), (148, 146540), (170, 127576), (185, 117232), (272, 79735), (296, 73270), (340, 63788), (370, 58616), (431, 50320), (592, 36635), (629, 34480), (680, 31894), (740, 29308), (862, 25160), (1258, 17240), (1360, 15947), (1480, 14654), (1724, 12580), (2155, 10064), (2516, 8620), (2960, 7327), (3145, 6896), (3448, 6290), (4310, 5032)]