21621280

素因数分解:

$2^5\times 5^1\times {\mathrm{17}}^1\times {\mathrm{7949}}^1$

素因数の和:7981

約数の個数: 48

約数和(自身を含む): 54091800

約数和(自身を除く): 32470520

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 40, 68, 80, 85, 136, 160, 170, 272, 340, 544, 680, 1360, 2720, 7949, 15898, 31796, 39745, 63592, 79490, 127184, 135133, 158980, 254368, 270266, 317960, 540532, 635920, 675665, 1081064, 1271840, 1351330, 2162128, 2702660, 4324256, 5405320, 10810640, 21621280]

約数ペア:

[(1, 21621280), (2, 10810640), (4, 5405320), (5, 4324256), (8, 2702660), (10, 2162128), (16, 1351330), (17, 1271840), (20, 1081064), (32, 675665), (34, 635920), (40, 540532), (68, 317960), (80, 270266), (85, 254368), (136, 158980), (160, 135133), (170, 127184), (272, 79490), (340, 63592), (544, 39745), (680, 31796), (1360, 15898), (2720, 7949)]