21609728

素因数分解:

$2^8\times 7^1\times {\mathrm{31}}^1\times {\mathrm{389}}^1$

素因数の和:443

約数の個数: 72

約数和(自身を含む): 51018240

約数和(自身を除く): 29408512

約数列:

[1, 2, 4, 7, 8, 14, 16, 28, 31, 32, 56, 62, 64, 112, 124, 128, 217, 224, 248, 256, 389, 434, 448, 496, 778, 868, 896, 992, 1556, 1736, 1792, 1984, 2723, 3112, 3472, 3968, 5446, 6224, 6944, 7936, 10892, 12059, 12448, 13888, 21784, 24118, 24896, 27776, 43568, 48236, 49792, 55552, 84413, 87136, 96472, 99584, 168826, 174272, 192944, 337652, 348544, 385888, 675304, 697088, 771776, 1350608, 1543552, 2701216, 3087104, 5402432, 10804864, 21609728]

約数ペア:

[(1, 21609728), (2, 10804864), (4, 5402432), (7, 3087104), (8, 2701216), (14, 1543552), (16, 1350608), (28, 771776), (31, 697088), (32, 675304), (56, 385888), (62, 348544), (64, 337652), (112, 192944), (124, 174272), (128, 168826), (217, 99584), (224, 96472), (248, 87136), (256, 84413), (389, 55552), (434, 49792), (448, 48236), (496, 43568), (778, 27776), (868, 24896), (896, 24118), (992, 21784), (1556, 13888), (1736, 12448), (1792, 12059), (1984, 10892), (2723, 7936), (3112, 6944), (3472, 6224), (3968, 5446)]