19712440

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{631}}^1$

素因数の和:724

約数の個数: 64

約数和(自身を含む): 49144320

約数和(自身を除く): 29431880

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 71, 88, 110, 142, 220, 284, 355, 440, 568, 631, 710, 781, 1262, 1420, 1562, 2524, 2840, 3124, 3155, 3905, 5048, 6248, 6310, 6941, 7810, 12620, 13882, 15620, 25240, 27764, 31240, 34705, 44801, 55528, 69410, 89602, 138820, 179204, 224005, 277640, 358408, 448010, 492811, 896020, 985622, 1792040, 1971244, 2464055, 3942488, 4928110, 9856220, 19712440]

約数ペア:

[(1, 19712440), (2, 9856220), (4, 4928110), (5, 3942488), (8, 2464055), (10, 1971244), (11, 1792040), (20, 985622), (22, 896020), (40, 492811), (44, 448010), (55, 358408), (71, 277640), (88, 224005), (110, 179204), (142, 138820), (220, 89602), (284, 69410), (355, 55528), (440, 44801), (568, 34705), (631, 31240), (710, 27764), (781, 25240), (1262, 15620), (1420, 13882), (1562, 12620), (2524, 7810), (2840, 6941), (3124, 6310), (3155, 6248), (3905, 5048)]