20394640

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{79}}^1\times {\mathrm{461}}^1$

素因数の和:560

約数の個数: 80

約数和(自身を含む): 54996480

約数和(自身を除く): 34601840

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 79, 80, 112, 140, 158, 280, 316, 395, 461, 553, 560, 632, 790, 922, 1106, 1264, 1580, 1844, 2212, 2305, 2765, 3160, 3227, 3688, 4424, 4610, 5530, 6320, 6454, 7376, 8848, 9220, 11060, 12908, 16135, 18440, 22120, 25816, 32270, 36419, 36880, 44240, 51632, 64540, 72838, 129080, 145676, 182095, 254933, 258160, 291352, 364190, 509866, 582704, 728380, 1019732, 1274665, 1456760, 2039464, 2549330, 2913520, 4078928, 5098660, 10197320, 20394640]

約数ペア:

[(1, 20394640), (2, 10197320), (4, 5098660), (5, 4078928), (7, 2913520), (8, 2549330), (10, 2039464), (14, 1456760), (16, 1274665), (20, 1019732), (28, 728380), (35, 582704), (40, 509866), (56, 364190), (70, 291352), (79, 258160), (80, 254933), (112, 182095), (140, 145676), (158, 129080), (280, 72838), (316, 64540), (395, 51632), (461, 44240), (553, 36880), (560, 36419), (632, 32270), (790, 25816), (922, 22120), (1106, 18440), (1264, 16135), (1580, 12908), (1844, 11060), (2212, 9220), (2305, 8848), (2765, 7376), (3160, 6454), (3227, 6320), (3688, 5530), (4424, 4610)]