21503020

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13963}}^1$

素因数の和:13990

約数の個数: 48

約数和(自身を含む): 56302848

約数和(自身を除く): 34799828

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 55, 70, 77, 110, 140, 154, 220, 308, 385, 770, 1540, 13963, 27926, 55852, 69815, 97741, 139630, 153593, 195482, 279260, 307186, 390964, 488705, 614372, 767965, 977410, 1075151, 1535930, 1954820, 2150302, 3071860, 4300604, 5375755, 10751510, 21503020]

約数ペア:

[(1, 21503020), (2, 10751510), (4, 5375755), (5, 4300604), (7, 3071860), (10, 2150302), (11, 1954820), (14, 1535930), (20, 1075151), (22, 977410), (28, 767965), (35, 614372), (44, 488705), (55, 390964), (70, 307186), (77, 279260), (110, 195482), (140, 153593), (154, 139630), (220, 97741), (308, 69815), (385, 55852), (770, 27926), (1540, 13963)]