20964880

素因数分解:

$2^4\times 5^1\times {\mathrm{71}}^1\times {\mathrm{3691}}^1$

素因数の和:3775

約数の個数: 40

約数和(自身を含む): 49443264

約数和(自身を除く): 28478384

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 71, 80, 142, 284, 355, 568, 710, 1136, 1420, 2840, 3691, 5680, 7382, 14764, 18455, 29528, 36910, 59056, 73820, 147640, 262061, 295280, 524122, 1048244, 1310305, 2096488, 2620610, 4192976, 5241220, 10482440, 20964880]

約数ペア:

[(1, 20964880), (2, 10482440), (4, 5241220), (5, 4192976), (8, 2620610), (10, 2096488), (16, 1310305), (20, 1048244), (40, 524122), (71, 295280), (80, 262061), (142, 147640), (284, 73820), (355, 59056), (568, 36910), (710, 29528), (1136, 18455), (1420, 14764), (2840, 7382), (3691, 5680)]