21751990

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^2\times {\mathrm{61}}^1\times {\mathrm{211}}^1$

素因数の和:305

約数の個数: 48

約数和(自身を含む): 43296336

約数和(自身を除く): 21544346

約数列:

[1, 2, 5, 10, 13, 26, 61, 65, 122, 130, 169, 211, 305, 338, 422, 610, 793, 845, 1055, 1586, 1690, 2110, 2743, 3965, 5486, 7930, 10309, 12871, 13715, 20618, 25742, 27430, 35659, 51545, 64355, 71318, 103090, 128710, 167323, 178295, 334646, 356590, 836615, 1673230, 2175199, 4350398, 10875995, 21751990]

約数ペア:

[(1, 21751990), (2, 10875995), (5, 4350398), (10, 2175199), (13, 1673230), (26, 836615), (61, 356590), (65, 334646), (122, 178295), (130, 167323), (169, 128710), (211, 103090), (305, 71318), (338, 64355), (422, 51545), (610, 35659), (793, 27430), (845, 25742), (1055, 20618), (1586, 13715), (1690, 12871), (2110, 10309), (2743, 7930), (3965, 5486)]