640096990

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{5477}}^1$

素因数の和:5557

約数の個数: 64

約数和(自身を含む): 1325237760

約数和(自身を除く): 685140770

約数列:

[1, 2, 5, 10, 13, 26, 29, 31, 58, 62, 65, 130, 145, 155, 290, 310, 377, 403, 754, 806, 899, 1798, 1885, 2015, 3770, 4030, 4495, 5477, 8990, 10954, 11687, 23374, 27385, 54770, 58435, 71201, 116870, 142402, 158833, 169787, 317666, 339574, 356005, 712010, 794165, 848935, 1588330, 1697870, 2064829, 2207231, 4129658, 4414462, 4923823, 9847646, 10324145, 11036155, 20648290, 22072310, 24619115, 49238230, 64009699, 128019398, 320048495, 640096990]

約数ペア:

[(1, 640096990), (2, 320048495), (5, 128019398), (10, 64009699), (13, 49238230), (26, 24619115), (29, 22072310), (31, 20648290), (58, 11036155), (62, 10324145), (65, 9847646), (130, 4923823), (145, 4414462), (155, 4129658), (290, 2207231), (310, 2064829), (377, 1697870), (403, 1588330), (754, 848935), (806, 794165), (899, 712010), (1798, 356005), (1885, 339574), (2015, 317666), (3770, 169787), (4030, 158833), (4495, 142402), (5477, 116870), (8990, 71201), (10954, 58435), (11687, 54770), (23374, 27385)]