21361840

素因数分解:

$2^4\times 5^1\times {\mathrm{257}}^1\times {\mathrm{1039}}^1$

素因数の和:1309

約数の個数: 40

約数和(自身を含む): 49907520

約数和(自身を除く): 28545680

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 257, 514, 1028, 1039, 1285, 2056, 2078, 2570, 4112, 4156, 5140, 5195, 8312, 10280, 10390, 16624, 20560, 20780, 41560, 83120, 267023, 534046, 1068092, 1335115, 2136184, 2670230, 4272368, 5340460, 10680920, 21361840]

約数ペア:

[(1, 21361840), (2, 10680920), (4, 5340460), (5, 4272368), (8, 2670230), (10, 2136184), (16, 1335115), (20, 1068092), (40, 534046), (80, 267023), (257, 83120), (514, 41560), (1028, 20780), (1039, 20560), (1285, 16624), (2056, 10390), (2078, 10280), (2570, 8312), (4112, 5195), (4156, 5140)]