20039720

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{61}}^1\times {\mathrm{191}}^1$

素因数の和:306

約数の個数: 64

約数和(自身を含む): 47139840

約数和(自身を除く): 27100120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 61, 86, 122, 172, 191, 215, 244, 305, 344, 382, 430, 488, 610, 764, 860, 955, 1220, 1528, 1720, 1910, 2440, 2623, 3820, 5246, 7640, 8213, 10492, 11651, 13115, 16426, 20984, 23302, 26230, 32852, 41065, 46604, 52460, 58255, 65704, 82130, 93208, 104920, 116510, 164260, 233020, 328520, 466040, 500993, 1001986, 2003972, 2504965, 4007944, 5009930, 10019860, 20039720]

約数ペア:

[(1, 20039720), (2, 10019860), (4, 5009930), (5, 4007944), (8, 2504965), (10, 2003972), (20, 1001986), (40, 500993), (43, 466040), (61, 328520), (86, 233020), (122, 164260), (172, 116510), (191, 104920), (215, 93208), (244, 82130), (305, 65704), (344, 58255), (382, 52460), (430, 46604), (488, 41065), (610, 32852), (764, 26230), (860, 23302), (955, 20984), (1220, 16426), (1528, 13115), (1720, 11651), (1910, 10492), (2440, 8213), (2623, 7640), (3820, 5246)]