21478815

素因数分解:

$3^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{89}}^1\times {\mathrm{173}}^1$

素因数の和:304

約数の個数: 48

約数和(自身を含む): 39087360

約数和(自身を除く): 17608545

約数列:

[1, 3, 5, 9, 15, 31, 45, 89, 93, 155, 173, 267, 279, 445, 465, 519, 801, 865, 1335, 1395, 1557, 2595, 2759, 4005, 5363, 7785, 8277, 13795, 15397, 16089, 24831, 26815, 41385, 46191, 48267, 76985, 80445, 124155, 138573, 230955, 241335, 477307, 692865, 1431921, 2386535, 4295763, 7159605, 21478815]

約数ペア:

[(1, 21478815), (3, 7159605), (5, 4295763), (9, 2386535), (15, 1431921), (31, 692865), (45, 477307), (89, 241335), (93, 230955), (155, 138573), (173, 124155), (267, 80445), (279, 76985), (445, 48267), (465, 46191), (519, 41385), (801, 26815), (865, 24831), (1335, 16089), (1395, 15397), (1557, 13795), (2595, 8277), (2759, 7785), (4005, 5363)]