21069860

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{89}}^2$

素因数の和:213

約数の個数: 72

約数和(自身を含む): 53833920

約数和(自身を除く): 32764060

約数列:

[1, 2, 4, 5, 7, 10, 14, 19, 20, 28, 35, 38, 70, 76, 89, 95, 133, 140, 178, 190, 266, 356, 380, 445, 532, 623, 665, 890, 1246, 1330, 1691, 1780, 2492, 2660, 3115, 3382, 6230, 6764, 7921, 8455, 11837, 12460, 15842, 16910, 23674, 31684, 33820, 39605, 47348, 55447, 59185, 79210, 110894, 118370, 150499, 158420, 221788, 236740, 277235, 300998, 554470, 601996, 752495, 1053493, 1108940, 1504990, 2106986, 3009980, 4213972, 5267465, 10534930, 21069860]

約数ペア:

[(1, 21069860), (2, 10534930), (4, 5267465), (5, 4213972), (7, 3009980), (10, 2106986), (14, 1504990), (19, 1108940), (20, 1053493), (28, 752495), (35, 601996), (38, 554470), (70, 300998), (76, 277235), (89, 236740), (95, 221788), (133, 158420), (140, 150499), (178, 118370), (190, 110894), (266, 79210), (356, 59185), (380, 55447), (445, 47348), (532, 39605), (623, 33820), (665, 31684), (890, 23674), (1246, 16910), (1330, 15842), (1691, 12460), (1780, 11837), (2492, 8455), (2660, 7921), (3115, 6764), (3382, 6230)]