21216520

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{40801}}^1$

素因数の和:40825

約数の個数: 32

約数和(自身を含む): 51410520

約数和(自身を除く): 30194000

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520, 40801, 81602, 163204, 204005, 326408, 408010, 530413, 816020, 1060826, 1632040, 2121652, 2652065, 4243304, 5304130, 10608260, 21216520]

約数ペア:

[(1, 21216520), (2, 10608260), (4, 5304130), (5, 4243304), (8, 2652065), (10, 2121652), (13, 1632040), (20, 1060826), (26, 816020), (40, 530413), (52, 408010), (65, 326408), (104, 204005), (130, 163204), (260, 81602), (520, 40801)]