21882640

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{397}}^1$

素因数の和:476

約数の個数: 80

約数和(自身を含む): 55965168

約数和(自身を除く): 34082528

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 53, 65, 80, 104, 106, 130, 208, 212, 260, 265, 397, 424, 520, 530, 689, 794, 848, 1040, 1060, 1378, 1588, 1985, 2120, 2756, 3176, 3445, 3970, 4240, 5161, 5512, 6352, 6890, 7940, 10322, 11024, 13780, 15880, 20644, 21041, 25805, 27560, 31760, 41288, 42082, 51610, 55120, 82576, 84164, 103220, 105205, 168328, 206440, 210410, 273533, 336656, 412880, 420820, 547066, 841640, 1094132, 1367665, 1683280, 2188264, 2735330, 4376528, 5470660, 10941320, 21882640]

約数ペア:

[(1, 21882640), (2, 10941320), (4, 5470660), (5, 4376528), (8, 2735330), (10, 2188264), (13, 1683280), (16, 1367665), (20, 1094132), (26, 841640), (40, 547066), (52, 420820), (53, 412880), (65, 336656), (80, 273533), (104, 210410), (106, 206440), (130, 168328), (208, 105205), (212, 103220), (260, 84164), (265, 82576), (397, 55120), (424, 51610), (520, 42082), (530, 41288), (689, 31760), (794, 27560), (848, 25805), (1040, 21041), (1060, 20644), (1378, 15880), (1588, 13780), (1985, 11024), (2120, 10322), (2756, 7940), (3176, 6890), (3445, 6352), (3970, 5512), (4240, 5161)]