21695660

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{4999}}^1$

素因数の和:5046

約数の個数: 48

約数和(自身を含む): 53760000

約数和(自身を除く): 32064340

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 31, 35, 62, 70, 124, 140, 155, 217, 310, 434, 620, 868, 1085, 2170, 4340, 4999, 9998, 19996, 24995, 34993, 49990, 69986, 99980, 139972, 154969, 174965, 309938, 349930, 619876, 699860, 774845, 1084783, 1549690, 2169566, 3099380, 4339132, 5423915, 10847830, 21695660]

約数ペア:

[(1, 21695660), (2, 10847830), (4, 5423915), (5, 4339132), (7, 3099380), (10, 2169566), (14, 1549690), (20, 1084783), (28, 774845), (31, 699860), (35, 619876), (62, 349930), (70, 309938), (124, 174965), (140, 154969), (155, 139972), (217, 99980), (310, 69986), (434, 49990), (620, 34993), (868, 24995), (1085, 19996), (2170, 9998), (4340, 4999)]