18209980

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{173}}^1\times {\mathrm{277}}^1$

素因数の和:478

約数の個数: 48

約数和(自身を含む): 40632480

約数和(自身を除く): 22422500

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 173, 190, 277, 346, 380, 554, 692, 865, 1108, 1385, 1730, 2770, 3287, 3460, 5263, 5540, 6574, 10526, 13148, 16435, 21052, 26315, 32870, 47921, 52630, 65740, 95842, 105260, 191684, 239605, 479210, 910499, 958420, 1820998, 3641996, 4552495, 9104990, 18209980]

約数ペア:

[(1, 18209980), (2, 9104990), (4, 4552495), (5, 3641996), (10, 1820998), (19, 958420), (20, 910499), (38, 479210), (76, 239605), (95, 191684), (173, 105260), (190, 95842), (277, 65740), (346, 52630), (380, 47921), (554, 32870), (692, 26315), (865, 21052), (1108, 16435), (1385, 13148), (1730, 10526), (2770, 6574), (3287, 5540), (3460, 5263)]