21905260

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{173}}^1\times {\mathrm{487}}^1$

素因数の和:682

約数の個数: 48

約数和(自身を含む): 49928256

約数和(自身を除く): 28022996

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 173, 260, 346, 487, 692, 865, 974, 1730, 1948, 2249, 2435, 3460, 4498, 4870, 6331, 8996, 9740, 11245, 12662, 22490, 25324, 31655, 44980, 63310, 84251, 126620, 168502, 337004, 421255, 842510, 1095263, 1685020, 2190526, 4381052, 5476315, 10952630, 21905260]

約数ペア:

[(1, 21905260), (2, 10952630), (4, 5476315), (5, 4381052), (10, 2190526), (13, 1685020), (20, 1095263), (26, 842510), (52, 421255), (65, 337004), (130, 168502), (173, 126620), (260, 84251), (346, 63310), (487, 44980), (692, 31655), (865, 25324), (974, 22490), (1730, 12662), (1948, 11245), (2249, 9740), (2435, 8996), (3460, 6331), (4498, 4870)]