20989984

素因数分解:

$2^5\times {\mathrm{19}}^2\times {\mathrm{23}}^1\times {\mathrm{79}}^1$

素因数の和:150

約数の個数: 72

約数和(自身を含む): 46085760

約数和(自身を除く): 25095776

約数列:

[1, 2, 4, 8, 16, 19, 23, 32, 38, 46, 76, 79, 92, 152, 158, 184, 304, 316, 361, 368, 437, 608, 632, 722, 736, 874, 1264, 1444, 1501, 1748, 1817, 2528, 2888, 3002, 3496, 3634, 5776, 6004, 6992, 7268, 8303, 11552, 12008, 13984, 14536, 16606, 24016, 28519, 29072, 33212, 34523, 48032, 57038, 58144, 66424, 69046, 114076, 132848, 138092, 228152, 265696, 276184, 456304, 552368, 655937, 912608, 1104736, 1311874, 2623748, 5247496, 10494992, 20989984]

約数ペア:

[(1, 20989984), (2, 10494992), (4, 5247496), (8, 2623748), (16, 1311874), (19, 1104736), (23, 912608), (32, 655937), (38, 552368), (46, 456304), (76, 276184), (79, 265696), (92, 228152), (152, 138092), (158, 132848), (184, 114076), (304, 69046), (316, 66424), (361, 58144), (368, 57038), (437, 48032), (608, 34523), (632, 33212), (722, 29072), (736, 28519), (874, 24016), (1264, 16606), (1444, 14536), (1501, 13984), (1748, 12008), (1817, 11552), (2528, 8303), (2888, 7268), (3002, 6992), (3496, 6004), (3634, 5776)]