21209920

素因数分解:

$2^6\times 5^1\times {\mathrm{79}}^1\times {\mathrm{839}}^1$

素因数の和:935

約数の個数: 56

約数和(自身を含む): 51206400

約数和(自身を除く): 29996480

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 79, 80, 158, 160, 316, 320, 395, 632, 790, 839, 1264, 1580, 1678, 2528, 3160, 3356, 4195, 5056, 6320, 6712, 8390, 12640, 13424, 16780, 25280, 26848, 33560, 53696, 66281, 67120, 132562, 134240, 265124, 268480, 331405, 530248, 662810, 1060496, 1325620, 2120992, 2651240, 4241984, 5302480, 10604960, 21209920]

約数ペア:

[(1, 21209920), (2, 10604960), (4, 5302480), (5, 4241984), (8, 2651240), (10, 2120992), (16, 1325620), (20, 1060496), (32, 662810), (40, 530248), (64, 331405), (79, 268480), (80, 265124), (158, 134240), (160, 132562), (316, 67120), (320, 66281), (395, 53696), (632, 33560), (790, 26848), (839, 25280), (1264, 16780), (1580, 13424), (1678, 12640), (2528, 8390), (3160, 6712), (3356, 6320), (4195, 5056)]