20902959

素因数分解:

$3^2\times 7^2\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{139}}^1$

素因数の和:201

約数の個数: 72

約数和(自身を含む): 39836160

約数和(自身を除く): 18933201

約数列:

[1, 3, 7, 9, 11, 21, 31, 33, 49, 63, 77, 93, 99, 139, 147, 217, 231, 279, 341, 417, 441, 539, 651, 693, 973, 1023, 1251, 1519, 1529, 1617, 1953, 2387, 2919, 3069, 4309, 4557, 4587, 4851, 6811, 7161, 8757, 10703, 12927, 13671, 13761, 16709, 20433, 21483, 30163, 32109, 38781, 47399, 50127, 61299, 74921, 90489, 96327, 142197, 150381, 211141, 224763, 271467, 331793, 426591, 633423, 674289, 995379, 1900269, 2322551, 2986137, 6967653, 20902959]

約数ペア:

[(1, 20902959), (3, 6967653), (7, 2986137), (9, 2322551), (11, 1900269), (21, 995379), (31, 674289), (33, 633423), (49, 426591), (63, 331793), (77, 271467), (93, 224763), (99, 211141), (139, 150381), (147, 142197), (217, 96327), (231, 90489), (279, 74921), (341, 61299), (417, 50127), (441, 47399), (539, 38781), (651, 32109), (693, 30163), (973, 21483), (1023, 20433), (1251, 16709), (1519, 13761), (1529, 13671), (1617, 12927), (1953, 10703), (2387, 8757), (2919, 7161), (3069, 6811), (4309, 4851), (4557, 4587)]