21216975

素因数分解:

$3^1\times 5^2\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{463}}^1$

素因数の和:536

約数の個数: 48

約数和(自身を含む): 38664192

約数和(自身を除く): 17447217

約数列:

[1, 3, 5, 13, 15, 25, 39, 47, 65, 75, 141, 195, 235, 325, 463, 611, 705, 975, 1175, 1389, 1833, 2315, 3055, 3525, 6019, 6945, 9165, 11575, 15275, 18057, 21761, 30095, 34725, 45825, 65283, 90285, 108805, 150475, 282893, 326415, 451425, 544025, 848679, 1414465, 1632075, 4243395, 7072325, 21216975]

約数ペア:

[(1, 21216975), (3, 7072325), (5, 4243395), (13, 1632075), (15, 1414465), (25, 848679), (39, 544025), (47, 451425), (65, 326415), (75, 282893), (141, 150475), (195, 108805), (235, 90285), (325, 65283), (463, 45825), (611, 34725), (705, 30095), (975, 21761), (1175, 18057), (1389, 15275), (1833, 11575), (2315, 9165), (3055, 6945), (3525, 6019)]