21164955

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{103}}^2$

素因数の和:240

約数の個数: 48

約数和(自身を含む): 41137920

約数和(自身を除く): 19972965

約数列:

[1, 3, 5, 7, 15, 19, 21, 35, 57, 95, 103, 105, 133, 285, 309, 399, 515, 665, 721, 1545, 1957, 1995, 2163, 3605, 5871, 9785, 10609, 10815, 13699, 29355, 31827, 41097, 53045, 68495, 74263, 159135, 201571, 205485, 222789, 371315, 604713, 1007855, 1113945, 1410997, 3023565, 4232991, 7054985, 21164955]

約数ペア:

[(1, 21164955), (3, 7054985), (5, 4232991), (7, 3023565), (15, 1410997), (19, 1113945), (21, 1007855), (35, 604713), (57, 371315), (95, 222789), (103, 205485), (105, 201571), (133, 159135), (285, 74263), (309, 68495), (399, 53045), (515, 41097), (665, 31827), (721, 29355), (1545, 13699), (1957, 10815), (1995, 10609), (2163, 9785), (3605, 5871)]