21145955

素因数分解:

$5^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{61}}^1\times {\mathrm{89}}^1$

素因数の和:215

約数の個数: 32

約数和(自身を含む): 28123200

約数和(自身を除く): 6977245

約数列:

[1, 5, 19, 41, 61, 89, 95, 205, 305, 445, 779, 1159, 1691, 2501, 3649, 3895, 5429, 5795, 8455, 12505, 18245, 27145, 47519, 69331, 103151, 222589, 237595, 346655, 515755, 1112945, 4229191, 21145955]

約数ペア:

[(1, 21145955), (5, 4229191), (19, 1112945), (41, 515755), (61, 346655), (89, 237595), (95, 222589), (205, 103151), (305, 69331), (445, 47519), (779, 27145), (1159, 18245), (1691, 12505), (2501, 8455), (3649, 5795), (3895, 5429)]