20821255

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{67}}^1\times {\mathrm{683}}^1$

素因数の和:775

約数の個数: 32

約数和(自身を含む): 31256064

約数和(自身を除く): 10434809

約数列:

[1, 5, 7, 13, 35, 65, 67, 91, 335, 455, 469, 683, 871, 2345, 3415, 4355, 4781, 6097, 8879, 23905, 30485, 44395, 45761, 62153, 228805, 310765, 320327, 594893, 1601635, 2974465, 4164251, 20821255]

約数ペア:

[(1, 20821255), (5, 4164251), (7, 2974465), (13, 1601635), (35, 594893), (65, 320327), (67, 310765), (91, 228805), (335, 62153), (455, 45761), (469, 44395), (683, 30485), (871, 23905), (2345, 8879), (3415, 6097), (4355, 4781)]