20996900

素因数分解:

$2^2\times 5^2\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{257}}^1$

素因数の和:333

約数の個数: 72

約数和(自身を含む): 49267680

約数和(自身を除く): 28270780

約数列:

[1, 2, 4, 5, 10, 19, 20, 25, 38, 43, 50, 76, 86, 95, 100, 172, 190, 215, 257, 380, 430, 475, 514, 817, 860, 950, 1028, 1075, 1285, 1634, 1900, 2150, 2570, 3268, 4085, 4300, 4883, 5140, 6425, 8170, 9766, 11051, 12850, 16340, 19532, 20425, 22102, 24415, 25700, 40850, 44204, 48830, 55255, 81700, 97660, 110510, 122075, 209969, 221020, 244150, 276275, 419938, 488300, 552550, 839876, 1049845, 1105100, 2099690, 4199380, 5249225, 10498450, 20996900]

約数ペア:

[(1, 20996900), (2, 10498450), (4, 5249225), (5, 4199380), (10, 2099690), (19, 1105100), (20, 1049845), (25, 839876), (38, 552550), (43, 488300), (50, 419938), (76, 276275), (86, 244150), (95, 221020), (100, 209969), (172, 122075), (190, 110510), (215, 97660), (257, 81700), (380, 55255), (430, 48830), (475, 44204), (514, 40850), (817, 25700), (860, 24415), (950, 22102), (1028, 20425), (1075, 19532), (1285, 16340), (1634, 12850), (1900, 11051), (2150, 9766), (2570, 8170), (3268, 6425), (4085, 5140), (4300, 4883)]