21039993

素因数分解:

$3^4\times {\mathrm{13}}^2\times {\mathrm{29}}^1\times {\mathrm{53}}^1$

素因数の和:120

約数の個数: 60

約数和(自身を含む): 35871660

約数和(自身を除く): 14831667

約数列:

[1, 3, 9, 13, 27, 29, 39, 53, 81, 87, 117, 159, 169, 261, 351, 377, 477, 507, 689, 783, 1053, 1131, 1431, 1521, 1537, 2067, 2349, 3393, 4293, 4563, 4611, 4901, 6201, 8957, 10179, 13689, 13833, 14703, 18603, 19981, 26871, 30537, 41499, 44109, 55809, 59943, 80613, 124497, 132327, 179829, 241839, 259753, 396981, 539487, 725517, 779259, 1618461, 2337777, 7013331, 21039993]

約数ペア:

[(1, 21039993), (3, 7013331), (9, 2337777), (13, 1618461), (27, 779259), (29, 725517), (39, 539487), (53, 396981), (81, 259753), (87, 241839), (117, 179829), (159, 132327), (169, 124497), (261, 80613), (351, 59943), (377, 55809), (477, 44109), (507, 41499), (689, 30537), (783, 26871), (1053, 19981), (1131, 18603), (1431, 14703), (1521, 13833), (1537, 13689), (2067, 10179), (2349, 8957), (3393, 6201), (4293, 4901), (4563, 4611)]