31480720

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{139}}^1\times {\mathrm{149}}^1$

素因数の和:320

約数の個数: 80

約数和(自身を含む): 78120000

約数和(自身を除く): 46639280

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 76, 80, 95, 139, 149, 152, 190, 278, 298, 304, 380, 556, 596, 695, 745, 760, 1112, 1192, 1390, 1490, 1520, 2224, 2384, 2641, 2780, 2831, 2980, 5282, 5560, 5662, 5960, 10564, 11120, 11324, 11920, 13205, 14155, 20711, 21128, 22648, 26410, 28310, 41422, 42256, 45296, 52820, 56620, 82844, 103555, 105640, 113240, 165688, 207110, 211280, 226480, 331376, 393509, 414220, 787018, 828440, 1574036, 1656880, 1967545, 3148072, 3935090, 6296144, 7870180, 15740360, 31480720]

約数ペア:

[(1, 31480720), (2, 15740360), (4, 7870180), (5, 6296144), (8, 3935090), (10, 3148072), (16, 1967545), (19, 1656880), (20, 1574036), (38, 828440), (40, 787018), (76, 414220), (80, 393509), (95, 331376), (139, 226480), (149, 211280), (152, 207110), (190, 165688), (278, 113240), (298, 105640), (304, 103555), (380, 82844), (556, 56620), (596, 52820), (695, 45296), (745, 42256), (760, 41422), (1112, 28310), (1192, 26410), (1390, 22648), (1490, 21128), (1520, 20711), (2224, 14155), (2384, 13205), (2641, 11920), (2780, 11324), (2831, 11120), (2980, 10564), (5282, 5960), (5560, 5662)]