18821720

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{89}}^1\times {\mathrm{311}}^1$

素因数の和:428

約数の個数: 64

約数和(自身を含む): 45489600

約数和(自身を除く): 26667880

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 89, 136, 170, 178, 311, 340, 356, 445, 622, 680, 712, 890, 1244, 1513, 1555, 1780, 2488, 3026, 3110, 3560, 5287, 6052, 6220, 7565, 10574, 12104, 12440, 15130, 21148, 26435, 27679, 30260, 42296, 52870, 55358, 60520, 105740, 110716, 138395, 211480, 221432, 276790, 470543, 553580, 941086, 1107160, 1882172, 2352715, 3764344, 4705430, 9410860, 18821720]

約数ペア:

[(1, 18821720), (2, 9410860), (4, 4705430), (5, 3764344), (8, 2352715), (10, 1882172), (17, 1107160), (20, 941086), (34, 553580), (40, 470543), (68, 276790), (85, 221432), (89, 211480), (136, 138395), (170, 110716), (178, 105740), (311, 60520), (340, 55358), (356, 52870), (445, 42296), (622, 30260), (680, 27679), (712, 26435), (890, 21148), (1244, 15130), (1513, 12440), (1555, 12104), (1780, 10574), (2488, 7565), (3026, 6220), (3110, 6052), (3560, 5287)]