20887490

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{71}}^1\times {\mathrm{73}}^1$

素因数の和:195

約数の個数: 64

約数和(自身を含む): 42964992

約数和(自身を除く): 22077502

約数列:

[1, 2, 5, 10, 13, 26, 31, 62, 65, 71, 73, 130, 142, 146, 155, 310, 355, 365, 403, 710, 730, 806, 923, 949, 1846, 1898, 2015, 2201, 2263, 4030, 4402, 4526, 4615, 4745, 5183, 9230, 9490, 10366, 11005, 11315, 22010, 22630, 25915, 28613, 29419, 51830, 57226, 58838, 67379, 134758, 143065, 147095, 160673, 286130, 294190, 321346, 336895, 673790, 803365, 1606730, 2088749, 4177498, 10443745, 20887490]

約数ペア:

[(1, 20887490), (2, 10443745), (5, 4177498), (10, 2088749), (13, 1606730), (26, 803365), (31, 673790), (62, 336895), (65, 321346), (71, 294190), (73, 286130), (130, 160673), (142, 147095), (146, 143065), (155, 134758), (310, 67379), (355, 58838), (365, 57226), (403, 51830), (710, 29419), (730, 28613), (806, 25915), (923, 22630), (949, 22010), (1846, 11315), (1898, 11005), (2015, 10366), (2201, 9490), (2263, 9230), (4030, 5183), (4402, 4745), (4526, 4615)]