20811945

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{487}}^1$

素因数の和:550

約数の個数: 64

約数和(自身を含む): 42725376

約数和(自身を除く): 21913431

約数列:

[1, 3, 5, 7, 11, 15, 21, 33, 35, 37, 55, 77, 105, 111, 165, 185, 231, 259, 385, 407, 487, 555, 777, 1155, 1221, 1295, 1461, 2035, 2435, 2849, 3409, 3885, 5357, 6105, 7305, 8547, 10227, 14245, 16071, 17045, 18019, 26785, 37499, 42735, 51135, 54057, 80355, 90095, 112497, 126133, 187495, 198209, 270285, 378399, 562485, 594627, 630665, 991045, 1387463, 1891995, 2973135, 4162389, 6937315, 20811945]

約数ペア:

[(1, 20811945), (3, 6937315), (5, 4162389), (7, 2973135), (11, 1891995), (15, 1387463), (21, 991045), (33, 630665), (35, 594627), (37, 562485), (55, 378399), (77, 270285), (105, 198209), (111, 187495), (165, 126133), (185, 112497), (231, 90095), (259, 80355), (385, 54057), (407, 51135), (487, 42735), (555, 37499), (777, 26785), (1155, 18019), (1221, 17045), (1295, 16071), (1461, 14245), (2035, 10227), (2435, 8547), (2849, 7305), (3409, 6105), (3885, 5357)]