21791560

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{223}}^1\times {\mathrm{349}}^1$

素因数の和:590

約数の個数: 64

約数和(自身を含む): 56448000

約数和(自身を除く): 34656440

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 223, 280, 349, 446, 698, 892, 1115, 1396, 1561, 1745, 1784, 2230, 2443, 2792, 3122, 3490, 4460, 4886, 6244, 6980, 7805, 8920, 9772, 12215, 12488, 13960, 15610, 19544, 24430, 31220, 48860, 62440, 77827, 97720, 155654, 311308, 389135, 544789, 622616, 778270, 1089578, 1556540, 2179156, 2723945, 3113080, 4358312, 5447890, 10895780, 21791560]

約数ペア:

[(1, 21791560), (2, 10895780), (4, 5447890), (5, 4358312), (7, 3113080), (8, 2723945), (10, 2179156), (14, 1556540), (20, 1089578), (28, 778270), (35, 622616), (40, 544789), (56, 389135), (70, 311308), (140, 155654), (223, 97720), (280, 77827), (349, 62440), (446, 48860), (698, 31220), (892, 24430), (1115, 19544), (1396, 15610), (1561, 13960), (1745, 12488), (1784, 12215), (2230, 9772), (2443, 8920), (2792, 7805), (3122, 6980), (3490, 6244), (4460, 4886)]