21059980

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{157}}^1\times {\mathrm{353}}^1$

素因数の和:538

約数の個数: 48

約数和(自身を含む): 46982880

約数和(自身を除く): 25922900

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 157, 190, 314, 353, 380, 628, 706, 785, 1412, 1570, 1765, 2983, 3140, 3530, 5966, 6707, 7060, 11932, 13414, 14915, 26828, 29830, 33535, 55421, 59660, 67070, 110842, 134140, 221684, 277105, 554210, 1052999, 1108420, 2105998, 4211996, 5264995, 10529990, 21059980]

約数ペア:

[(1, 21059980), (2, 10529990), (4, 5264995), (5, 4211996), (10, 2105998), (19, 1108420), (20, 1052999), (38, 554210), (76, 277105), (95, 221684), (157, 134140), (190, 110842), (314, 67070), (353, 59660), (380, 55421), (628, 33535), (706, 29830), (785, 26828), (1412, 14915), (1570, 13414), (1765, 11932), (2983, 7060), (3140, 6707), (3530, 5966)]