21307880

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{79}}^1\times {\mathrm{613}}^1$

素因数の和:714

約数の個数: 64

約数和(自身を含む): 53049600

約数和(自身を除く): 31741720

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 79, 88, 110, 158, 220, 316, 395, 440, 613, 632, 790, 869, 1226, 1580, 1738, 2452, 3065, 3160, 3476, 4345, 4904, 6130, 6743, 6952, 8690, 12260, 13486, 17380, 24520, 26972, 33715, 34760, 48427, 53944, 67430, 96854, 134860, 193708, 242135, 269720, 387416, 484270, 532697, 968540, 1065394, 1937080, 2130788, 2663485, 4261576, 5326970, 10653940, 21307880]

約数ペア:

[(1, 21307880), (2, 10653940), (4, 5326970), (5, 4261576), (8, 2663485), (10, 2130788), (11, 1937080), (20, 1065394), (22, 968540), (40, 532697), (44, 484270), (55, 387416), (79, 269720), (88, 242135), (110, 193708), (158, 134860), (220, 96854), (316, 67430), (395, 53944), (440, 48427), (613, 34760), (632, 33715), (790, 26972), (869, 24520), (1226, 17380), (1580, 13486), (1738, 12260), (2452, 8690), (3065, 6952), (3160, 6743), (3476, 6130), (4345, 4904)]