161878900

素因数分解:

$2^2\times 5^2\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{661}}^1$

素因数の和:785

約数の個数: 72

約数和(自身を含む): 367754240

約数和(自身を除く): 205875340

約数列:

[1, 2, 4, 5, 10, 20, 25, 31, 50, 62, 79, 100, 124, 155, 158, 310, 316, 395, 620, 661, 775, 790, 1322, 1550, 1580, 1975, 2449, 2644, 3100, 3305, 3950, 4898, 6610, 7900, 9796, 12245, 13220, 16525, 20491, 24490, 33050, 40982, 48980, 52219, 61225, 66100, 81964, 102455, 104438, 122450, 204910, 208876, 244900, 261095, 409820, 512275, 522190, 1024550, 1044380, 1305475, 1618789, 2049100, 2610950, 3237578, 5221900, 6475156, 8093945, 16187890, 32375780, 40469725, 80939450, 161878900]

約数ペア:

[(1, 161878900), (2, 80939450), (4, 40469725), (5, 32375780), (10, 16187890), (20, 8093945), (25, 6475156), (31, 5221900), (50, 3237578), (62, 2610950), (79, 2049100), (100, 1618789), (124, 1305475), (155, 1044380), (158, 1024550), (310, 522190), (316, 512275), (395, 409820), (620, 261095), (661, 244900), (775, 208876), (790, 204910), (1322, 122450), (1550, 104438), (1580, 102455), (1975, 81964), (2449, 66100), (2644, 61225), (3100, 52219), (3305, 48980), (3950, 40982), (4898, 33050), (6610, 24490), (7900, 20491), (9796, 16525), (12245, 13220)]