21496840

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{101}}^1\times {\mathrm{313}}^1$

素因数の和:442

約数の個数: 64

約数和(自身を含む): 51885360

約数和(自身を除く): 30388520

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 101, 136, 170, 202, 313, 340, 404, 505, 626, 680, 808, 1010, 1252, 1565, 1717, 2020, 2504, 3130, 3434, 4040, 5321, 6260, 6868, 8585, 10642, 12520, 13736, 17170, 21284, 26605, 31613, 34340, 42568, 53210, 63226, 68680, 106420, 126452, 158065, 212840, 252904, 316130, 537421, 632260, 1074842, 1264520, 2149684, 2687105, 4299368, 5374210, 10748420, 21496840]

約数ペア:

[(1, 21496840), (2, 10748420), (4, 5374210), (5, 4299368), (8, 2687105), (10, 2149684), (17, 1264520), (20, 1074842), (34, 632260), (40, 537421), (68, 316130), (85, 252904), (101, 212840), (136, 158065), (170, 126452), (202, 106420), (313, 68680), (340, 63226), (404, 53210), (505, 42568), (626, 34340), (680, 31613), (808, 26605), (1010, 21284), (1252, 17170), (1565, 13736), (1717, 12520), (2020, 10642), (2504, 8585), (3130, 6868), (3434, 6260), (4040, 5321)]