20688920

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{1997}}^1$

素因数の和:2052

約数の個数: 64

約数和(自身を含む): 54665280

約数和(自身を除く): 33976360

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 37, 40, 56, 70, 74, 140, 148, 185, 259, 280, 296, 370, 518, 740, 1036, 1295, 1480, 1997, 2072, 2590, 3994, 5180, 7988, 9985, 10360, 13979, 15976, 19970, 27958, 39940, 55916, 69895, 73889, 79880, 111832, 139790, 147778, 279580, 295556, 369445, 517223, 559160, 591112, 738890, 1034446, 1477780, 2068892, 2586115, 2955560, 4137784, 5172230, 10344460, 20688920]

約数ペア:

[(1, 20688920), (2, 10344460), (4, 5172230), (5, 4137784), (7, 2955560), (8, 2586115), (10, 2068892), (14, 1477780), (20, 1034446), (28, 738890), (35, 591112), (37, 559160), (40, 517223), (56, 369445), (70, 295556), (74, 279580), (140, 147778), (148, 139790), (185, 111832), (259, 79880), (280, 73889), (296, 69895), (370, 55916), (518, 39940), (740, 27958), (1036, 19970), (1295, 15976), (1480, 13979), (1997, 10360), (2072, 9985), (2590, 7988), (3994, 5180)]