21856040

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{97}}^1\times {\mathrm{131}}^1$

素因数の和:282

約数の個数: 64

約数和(自身を含む): 51226560

約数和(自身を除く): 29370520

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 97, 131, 172, 194, 215, 262, 344, 388, 430, 485, 524, 655, 776, 860, 970, 1048, 1310, 1720, 1940, 2620, 3880, 4171, 5240, 5633, 8342, 11266, 12707, 16684, 20855, 22532, 25414, 28165, 33368, 41710, 45064, 50828, 56330, 63535, 83420, 101656, 112660, 127070, 166840, 225320, 254140, 508280, 546401, 1092802, 2185604, 2732005, 4371208, 5464010, 10928020, 21856040]

約数ペア:

[(1, 21856040), (2, 10928020), (4, 5464010), (5, 4371208), (8, 2732005), (10, 2185604), (20, 1092802), (40, 546401), (43, 508280), (86, 254140), (97, 225320), (131, 166840), (172, 127070), (194, 112660), (215, 101656), (262, 83420), (344, 63535), (388, 56330), (430, 50828), (485, 45064), (524, 41710), (655, 33368), (776, 28165), (860, 25414), (970, 22532), (1048, 20855), (1310, 16684), (1720, 12707), (1940, 11266), (2620, 8342), (3880, 5633), (4171, 5240)]