21511640

素因数分解:

$2^3\times 5^1\times {\mathrm{53}}^1\times {\mathrm{73}}^1\times {\mathrm{139}}^1$

素因数の和:276

約数の個数: 64

約数和(自身を含む): 50349600

約数和(自身を除く): 28837960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 53, 73, 106, 139, 146, 212, 265, 278, 292, 365, 424, 530, 556, 584, 695, 730, 1060, 1112, 1390, 1460, 2120, 2780, 2920, 3869, 5560, 7367, 7738, 10147, 14734, 15476, 19345, 20294, 29468, 30952, 36835, 38690, 40588, 50735, 58936, 73670, 77380, 81176, 101470, 147340, 154760, 202940, 294680, 405880, 537791, 1075582, 2151164, 2688955, 4302328, 5377910, 10755820, 21511640]

約数ペア:

[(1, 21511640), (2, 10755820), (4, 5377910), (5, 4302328), (8, 2688955), (10, 2151164), (20, 1075582), (40, 537791), (53, 405880), (73, 294680), (106, 202940), (139, 154760), (146, 147340), (212, 101470), (265, 81176), (278, 77380), (292, 73670), (365, 58936), (424, 50735), (530, 40588), (556, 38690), (584, 36835), (695, 30952), (730, 29468), (1060, 20294), (1112, 19345), (1390, 15476), (1460, 14734), (2120, 10147), (2780, 7738), (2920, 7367), (3869, 5560)]