21381568

素因数分解:

$2^6\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{829}}^1$

素因数の和:885

約数の個数: 56

約数和(自身を含む): 47223680

約数和(自身を除く): 25842112

約数列:

[1, 2, 4, 8, 13, 16, 26, 31, 32, 52, 62, 64, 104, 124, 208, 248, 403, 416, 496, 806, 829, 832, 992, 1612, 1658, 1984, 3224, 3316, 6448, 6632, 10777, 12896, 13264, 21554, 25699, 25792, 26528, 43108, 51398, 53056, 86216, 102796, 172432, 205592, 334087, 344864, 411184, 668174, 689728, 822368, 1336348, 1644736, 2672696, 5345392, 10690784, 21381568]

約数ペア:

[(1, 21381568), (2, 10690784), (4, 5345392), (8, 2672696), (13, 1644736), (16, 1336348), (26, 822368), (31, 689728), (32, 668174), (52, 411184), (62, 344864), (64, 334087), (104, 205592), (124, 172432), (208, 102796), (248, 86216), (403, 53056), (416, 51398), (496, 43108), (806, 26528), (829, 25792), (832, 25699), (992, 21554), (1612, 13264), (1658, 12896), (1984, 10777), (3224, 6632), (3316, 6448)]