21021455

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{983}}^1$

素因数の和:1055

約数の個数: 32

約数和(自身を含む): 31739904

約数和(自身を除く): 10718449

約数列:

[1, 5, 7, 13, 35, 47, 65, 91, 235, 329, 455, 611, 983, 1645, 3055, 4277, 4915, 6881, 12779, 21385, 34405, 46201, 63895, 89453, 231005, 323407, 447265, 600613, 1617035, 3003065, 4204291, 21021455]

約数ペア:

[(1, 21021455), (5, 4204291), (7, 3003065), (13, 1617035), (35, 600613), (47, 447265), (65, 323407), (91, 231005), (235, 89453), (329, 63895), (455, 46201), (611, 34405), (983, 21385), (1645, 12779), (3055, 6881), (4277, 4915)]