21931720

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{43}}^1\times {\mathrm{311}}^1$

素因数の和:406

約数の個数: 64

約数和(自身を含む): 51891840

約数和(自身を除く): 29960120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 43, 82, 86, 164, 172, 205, 215, 311, 328, 344, 410, 430, 622, 820, 860, 1244, 1555, 1640, 1720, 1763, 2488, 3110, 3526, 6220, 7052, 8815, 12440, 12751, 13373, 14104, 17630, 25502, 26746, 35260, 51004, 53492, 63755, 66865, 70520, 102008, 106984, 127510, 133730, 255020, 267460, 510040, 534920, 548293, 1096586, 2193172, 2741465, 4386344, 5482930, 10965860, 21931720]

約数ペア:

[(1, 21931720), (2, 10965860), (4, 5482930), (5, 4386344), (8, 2741465), (10, 2193172), (20, 1096586), (40, 548293), (41, 534920), (43, 510040), (82, 267460), (86, 255020), (164, 133730), (172, 127510), (205, 106984), (215, 102008), (311, 70520), (328, 66865), (344, 63755), (410, 53492), (430, 51004), (622, 35260), (820, 26746), (860, 25502), (1244, 17630), (1555, 14104), (1640, 13373), (1720, 12751), (1763, 12440), (2488, 8815), (3110, 7052), (3526, 6220)]