20657840

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{997}}^1$

素因数の和:1054

約数の個数: 80

約数和(自身を含む): 56430912

約数和(自身を除く): 35773072

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 37, 40, 56, 70, 74, 80, 112, 140, 148, 185, 259, 280, 296, 370, 518, 560, 592, 740, 997, 1036, 1295, 1480, 1994, 2072, 2590, 2960, 3988, 4144, 4985, 5180, 6979, 7976, 9970, 10360, 13958, 15952, 19940, 20720, 27916, 34895, 36889, 39880, 55832, 69790, 73778, 79760, 111664, 139580, 147556, 184445, 258223, 279160, 295112, 368890, 516446, 558320, 590224, 737780, 1032892, 1291115, 1475560, 2065784, 2582230, 2951120, 4131568, 5164460, 10328920, 20657840]

約数ペア:

[(1, 20657840), (2, 10328920), (4, 5164460), (5, 4131568), (7, 2951120), (8, 2582230), (10, 2065784), (14, 1475560), (16, 1291115), (20, 1032892), (28, 737780), (35, 590224), (37, 558320), (40, 516446), (56, 368890), (70, 295112), (74, 279160), (80, 258223), (112, 184445), (140, 147556), (148, 139580), (185, 111664), (259, 79760), (280, 73778), (296, 69790), (370, 55832), (518, 39880), (560, 36889), (592, 34895), (740, 27916), (997, 20720), (1036, 19940), (1295, 15952), (1480, 13958), (1994, 10360), (2072, 9970), (2590, 7976), (2960, 6979), (3988, 5180), (4144, 4985)]