21175040

素因数分解:

$2^8\times 5^1\times {\mathrm{71}}^1\times {\mathrm{233}}^1$

素因数の和:325

約数の個数: 72

約数和(自身を含む): 51655968

約数和(自身を除く): 30480928

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 71, 80, 128, 142, 160, 233, 256, 284, 320, 355, 466, 568, 640, 710, 932, 1136, 1165, 1280, 1420, 1864, 2272, 2330, 2840, 3728, 4544, 4660, 5680, 7456, 9088, 9320, 11360, 14912, 16543, 18176, 18640, 22720, 29824, 33086, 37280, 45440, 59648, 66172, 74560, 82715, 90880, 132344, 149120, 165430, 264688, 298240, 330860, 529376, 661720, 1058752, 1323440, 2117504, 2646880, 4235008, 5293760, 10587520, 21175040]

約数ペア:

[(1, 21175040), (2, 10587520), (4, 5293760), (5, 4235008), (8, 2646880), (10, 2117504), (16, 1323440), (20, 1058752), (32, 661720), (40, 529376), (64, 330860), (71, 298240), (80, 264688), (128, 165430), (142, 149120), (160, 132344), (233, 90880), (256, 82715), (284, 74560), (320, 66172), (355, 59648), (466, 45440), (568, 37280), (640, 33086), (710, 29824), (932, 22720), (1136, 18640), (1165, 18176), (1280, 16543), (1420, 14912), (1864, 11360), (2272, 9320), (2330, 9088), (2840, 7456), (3728, 5680), (4544, 4660)]