21251988

素因数分解:

$2^2\times 3^2\times {\mathrm{31}}^1\times {\mathrm{137}}^1\times {\mathrm{139}}^1$

素因数の和:317

約数の個数: 72

約数和(自身を含む): 56259840

約数和(自身を除く): 35007852

約数列:

[1, 2, 3, 4, 6, 9, 12, 18, 31, 36, 62, 93, 124, 137, 139, 186, 274, 278, 279, 372, 411, 417, 548, 556, 558, 822, 834, 1116, 1233, 1251, 1644, 1668, 2466, 2502, 4247, 4309, 4932, 5004, 8494, 8618, 12741, 12927, 16988, 17236, 19043, 25482, 25854, 38086, 38223, 38781, 50964, 51708, 57129, 76172, 76446, 77562, 114258, 152892, 155124, 171387, 228516, 342774, 590333, 685548, 1180666, 1770999, 2361332, 3541998, 5312997, 7083996, 10625994, 21251988]

約数ペア:

[(1, 21251988), (2, 10625994), (3, 7083996), (4, 5312997), (6, 3541998), (9, 2361332), (12, 1770999), (18, 1180666), (31, 685548), (36, 590333), (62, 342774), (93, 228516), (124, 171387), (137, 155124), (139, 152892), (186, 114258), (274, 77562), (278, 76446), (279, 76172), (372, 57129), (411, 51708), (417, 50964), (548, 38781), (556, 38223), (558, 38086), (822, 25854), (834, 25482), (1116, 19043), (1233, 17236), (1251, 16988), (1644, 12927), (1668, 12741), (2466, 8618), (2502, 8494), (4247, 5004), (4309, 4932)]