18781785

素因数分解:

$3^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{1997}}^1$

素因数の和:2038

約数の個数: 48

約数和(自身を含む): 37402560

約数和(自身を除く): 18620775

約数列:

[1, 3, 5, 9, 11, 15, 19, 33, 45, 55, 57, 95, 99, 165, 171, 209, 285, 495, 627, 855, 1045, 1881, 1997, 3135, 5991, 9405, 9985, 17973, 21967, 29955, 37943, 65901, 89865, 109835, 113829, 189715, 197703, 329505, 341487, 417373, 569145, 988515, 1252119, 1707435, 2086865, 3756357, 6260595, 18781785]

約数ペア:

[(1, 18781785), (3, 6260595), (5, 3756357), (9, 2086865), (11, 1707435), (15, 1252119), (19, 988515), (33, 569145), (45, 417373), (55, 341487), (57, 329505), (95, 197703), (99, 189715), (165, 113829), (171, 109835), (209, 89865), (285, 65901), (495, 37943), (627, 29955), (855, 21967), (1045, 17973), (1881, 9985), (1997, 9405), (3135, 5991)]