20987248

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{131}}^1$

素因数の和:206

約数の個数: 80

約数和(自身を含む): 47139840

約数和(自身を除く): 26152592

約数列:

[1, 2, 4, 8, 16, 17, 19, 31, 34, 38, 62, 68, 76, 124, 131, 136, 152, 248, 262, 272, 304, 323, 496, 524, 527, 589, 646, 1048, 1054, 1178, 1292, 2096, 2108, 2227, 2356, 2489, 2584, 4061, 4216, 4454, 4712, 4978, 5168, 8122, 8432, 8908, 9424, 9956, 10013, 16244, 17816, 19912, 20026, 32488, 35632, 39824, 40052, 42313, 64976, 69037, 77159, 80104, 84626, 138074, 154318, 160208, 169252, 276148, 308636, 338504, 552296, 617272, 677008, 1104592, 1234544, 1311703, 2623406, 5246812, 10493624, 20987248]

約数ペア:

[(1, 20987248), (2, 10493624), (4, 5246812), (8, 2623406), (16, 1311703), (17, 1234544), (19, 1104592), (31, 677008), (34, 617272), (38, 552296), (62, 338504), (68, 308636), (76, 276148), (124, 169252), (131, 160208), (136, 154318), (152, 138074), (248, 84626), (262, 80104), (272, 77159), (304, 69037), (323, 64976), (496, 42313), (524, 40052), (527, 39824), (589, 35632), (646, 32488), (1048, 20026), (1054, 19912), (1178, 17816), (1292, 16244), (2096, 10013), (2108, 9956), (2227, 9424), (2356, 8908), (2489, 8432), (2584, 8122), (4061, 5168), (4216, 4978), (4454, 4712)]