20005865

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{61}}^1\times {\mathrm{67}}^1\times {\mathrm{89}}^1$

素因数の和:233

約数の個数: 32

約数和(自身を含む): 27319680

約数和(自身を除く): 7313815

約数列:

[1, 5, 11, 55, 61, 67, 89, 305, 335, 445, 671, 737, 979, 3355, 3685, 4087, 4895, 5429, 5963, 20435, 27145, 29815, 44957, 59719, 65593, 224785, 298595, 327965, 363743, 1818715, 4001173, 20005865]

約数ペア:

[(1, 20005865), (5, 4001173), (11, 1818715), (55, 363743), (61, 327965), (67, 298595), (89, 224785), (305, 65593), (335, 59719), (445, 44957), (671, 29815), (737, 27145), (979, 20435), (3355, 5963), (3685, 5429), (4087, 4895)]