21380905

素因数分解:

$5^1\times 7^4\times {\mathrm{13}}^1\times {\mathrm{137}}^1$

素因数の和:183

約数の個数: 40

約数和(自身を含む): 32469192

約数和(自身を除く): 11088287

約数列:

[1, 5, 7, 13, 35, 49, 65, 91, 137, 245, 343, 455, 637, 685, 959, 1715, 1781, 2401, 3185, 4459, 4795, 6713, 8905, 12005, 12467, 22295, 31213, 33565, 46991, 62335, 87269, 156065, 234955, 328937, 436345, 610883, 1644685, 3054415, 4276181, 21380905]

約数ペア:

[(1, 21380905), (5, 4276181), (7, 3054415), (13, 1644685), (35, 610883), (49, 436345), (65, 328937), (91, 234955), (137, 156065), (245, 87269), (343, 62335), (455, 46991), (637, 33565), (685, 31213), (959, 22295), (1715, 12467), (1781, 12005), (2401, 8905), (3185, 6713), (4459, 4795)]