21644020

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{113}}^1\times {\mathrm{157}}^1$

素因数の和:340

約数の個数: 48

約数和(自身を含む): 46903248

約数和(自身を除く): 25259228

約数列:

[1, 2, 4, 5, 10, 20, 61, 113, 122, 157, 226, 244, 305, 314, 452, 565, 610, 628, 785, 1130, 1220, 1570, 2260, 3140, 6893, 9577, 13786, 17741, 19154, 27572, 34465, 35482, 38308, 47885, 68930, 70964, 88705, 95770, 137860, 177410, 191540, 354820, 1082201, 2164402, 4328804, 5411005, 10822010, 21644020]

約数ペア:

[(1, 21644020), (2, 10822010), (4, 5411005), (5, 4328804), (10, 2164402), (20, 1082201), (61, 354820), (113, 191540), (122, 177410), (157, 137860), (226, 95770), (244, 88705), (305, 70964), (314, 68930), (452, 47885), (565, 38308), (610, 35482), (628, 34465), (785, 27572), (1130, 19154), (1220, 17741), (1570, 13786), (2260, 9577), (3140, 6893)]