21317289

素因数分解:

$3^1\times 7^1\times {\mathrm{53}}^1\times {\mathrm{107}}^1\times {\mathrm{179}}^1$

素因数の和:349

約数の個数: 32

約数和(自身を含む): 33592320

約数和(自身を除く): 12275031

約数列:

[1, 3, 7, 21, 53, 107, 159, 179, 321, 371, 537, 749, 1113, 1253, 2247, 3759, 5671, 9487, 17013, 19153, 28461, 39697, 57459, 66409, 119091, 134071, 199227, 402213, 1015109, 3045327, 7105763, 21317289]

約数ペア:

[(1, 21317289), (3, 7105763), (7, 3045327), (21, 1015109), (53, 402213), (107, 199227), (159, 134071), (179, 119091), (321, 66409), (371, 57459), (537, 39697), (749, 28461), (1113, 19153), (1253, 17013), (2247, 9487), (3759, 5671)]