21252075

素因数分解:

$3^1\times 5^2\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{307}}^1$

素因数の和:404

約数の個数: 48

約数和(自身を含む): 38497536

約数和(自身を除く): 17245461

約数列:

[1, 3, 5, 13, 15, 25, 39, 65, 71, 75, 195, 213, 307, 325, 355, 921, 923, 975, 1065, 1535, 1775, 2769, 3991, 4605, 4615, 5325, 7675, 11973, 13845, 19955, 21797, 23025, 23075, 59865, 65391, 69225, 99775, 108985, 283361, 299325, 326955, 544925, 850083, 1416805, 1634775, 4250415, 7084025, 21252075]

約数ペア:

[(1, 21252075), (3, 7084025), (5, 4250415), (13, 1634775), (15, 1416805), (25, 850083), (39, 544925), (65, 326955), (71, 299325), (75, 283361), (195, 108985), (213, 99775), (307, 69225), (325, 65391), (355, 59865), (921, 23075), (923, 23025), (975, 21797), (1065, 19955), (1535, 13845), (1775, 11973), (2769, 7675), (3991, 5325), (4605, 4615)]