19979856

素因数分解:

$2^4\times 3^2\times {\mathrm{13}}^2\times {\mathrm{821}}^1$

素因数の和:861

約数の個数: 90

約数和(自身を含む): 60621678

約数和(自身を除く): 40641822

約数列:

[1, 2, 3, 4, 6, 8, 9, 12, 13, 16, 18, 24, 26, 36, 39, 48, 52, 72, 78, 104, 117, 144, 156, 169, 208, 234, 312, 338, 468, 507, 624, 676, 821, 936, 1014, 1352, 1521, 1642, 1872, 2028, 2463, 2704, 3042, 3284, 4056, 4926, 6084, 6568, 7389, 8112, 9852, 10673, 12168, 13136, 14778, 19704, 21346, 24336, 29556, 32019, 39408, 42692, 59112, 64038, 85384, 96057, 118224, 128076, 138749, 170768, 192114, 256152, 277498, 384228, 416247, 512304, 554996, 768456, 832494, 1109992, 1248741, 1536912, 1664988, 2219984, 2497482, 3329976, 4994964, 6659952, 9989928, 19979856]

約数ペア:

[(1, 19979856), (2, 9989928), (3, 6659952), (4, 4994964), (6, 3329976), (8, 2497482), (9, 2219984), (12, 1664988), (13, 1536912), (16, 1248741), (18, 1109992), (24, 832494), (26, 768456), (36, 554996), (39, 512304), (48, 416247), (52, 384228), (72, 277498), (78, 256152), (104, 192114), (117, 170768), (144, 138749), (156, 128076), (169, 118224), (208, 96057), (234, 85384), (312, 64038), (338, 59112), (468, 42692), (507, 39408), (624, 32019), (676, 29556), (821, 24336), (936, 21346), (1014, 19704), (1352, 14778), (1521, 13136), (1642, 12168), (1872, 10673), (2028, 9852), (2463, 8112), (2704, 7389), (3042, 6568), (3284, 6084), (4056, 4926)]