21218260

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{4889}}^1$

素因数の和:4936

約数の個数: 48

約数和(自身を含む): 52577280

約数和(自身を除く): 31359020

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 31, 35, 62, 70, 124, 140, 155, 217, 310, 434, 620, 868, 1085, 2170, 4340, 4889, 9778, 19556, 24445, 34223, 48890, 68446, 97780, 136892, 151559, 171115, 303118, 342230, 606236, 684460, 757795, 1060913, 1515590, 2121826, 3031180, 4243652, 5304565, 10609130, 21218260]

約数ペア:

[(1, 21218260), (2, 10609130), (4, 5304565), (5, 4243652), (7, 3031180), (10, 2121826), (14, 1515590), (20, 1060913), (28, 757795), (31, 684460), (35, 606236), (62, 342230), (70, 303118), (124, 171115), (140, 151559), (155, 136892), (217, 97780), (310, 68446), (434, 48890), (620, 34223), (868, 24445), (1085, 19556), (2170, 9778), (4340, 4889)]