21145040

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{61}}^1\times {\mathrm{619}}^1$

素因数の和:700

約数の個数: 80

約数和(自身を含む): 57198720

約数和(自身を除く): 36053680

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 61, 70, 80, 112, 122, 140, 244, 280, 305, 427, 488, 560, 610, 619, 854, 976, 1220, 1238, 1708, 2135, 2440, 2476, 3095, 3416, 4270, 4333, 4880, 4952, 6190, 6832, 8540, 8666, 9904, 12380, 17080, 17332, 21665, 24760, 34160, 34664, 37759, 43330, 49520, 69328, 75518, 86660, 151036, 173320, 188795, 264313, 302072, 346640, 377590, 528626, 604144, 755180, 1057252, 1321565, 1510360, 2114504, 2643130, 3020720, 4229008, 5286260, 10572520, 21145040]

約数ペア:

[(1, 21145040), (2, 10572520), (4, 5286260), (5, 4229008), (7, 3020720), (8, 2643130), (10, 2114504), (14, 1510360), (16, 1321565), (20, 1057252), (28, 755180), (35, 604144), (40, 528626), (56, 377590), (61, 346640), (70, 302072), (80, 264313), (112, 188795), (122, 173320), (140, 151036), (244, 86660), (280, 75518), (305, 69328), (427, 49520), (488, 43330), (560, 37759), (610, 34664), (619, 34160), (854, 24760), (976, 21665), (1220, 17332), (1238, 17080), (1708, 12380), (2135, 9904), (2440, 8666), (2476, 8540), (3095, 6832), (3416, 6190), (4270, 4952), (4333, 4880)]