21189712

素因数分解:

$2^4\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{1621}}^1$

素因数の和:1691

約数の個数: 40

約数和(自身を含む): 44248160

約数和(自身を除く): 23058448

約数列:

[1, 2, 4, 8, 16, 19, 38, 43, 76, 86, 152, 172, 304, 344, 688, 817, 1621, 1634, 3242, 3268, 6484, 6536, 12968, 13072, 25936, 30799, 61598, 69703, 123196, 139406, 246392, 278812, 492784, 557624, 1115248, 1324357, 2648714, 5297428, 10594856, 21189712]

約数ペア:

[(1, 21189712), (2, 10594856), (4, 5297428), (8, 2648714), (16, 1324357), (19, 1115248), (38, 557624), (43, 492784), (76, 278812), (86, 246392), (152, 139406), (172, 123196), (304, 69703), (344, 61598), (688, 30799), (817, 25936), (1621, 13072), (1634, 12968), (3242, 6536), (3268, 6484)]