21458980

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{149}}^1\times {\mathrm{379}}^1$

素因数の和:556

約数の個数: 48

約数和(自身を含む): 47880000

約数和(自身を除く): 26421020

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 149, 190, 298, 379, 380, 596, 745, 758, 1490, 1516, 1895, 2831, 2980, 3790, 5662, 7201, 7580, 11324, 14155, 14402, 28310, 28804, 36005, 56471, 56620, 72010, 112942, 144020, 225884, 282355, 564710, 1072949, 1129420, 2145898, 4291796, 5364745, 10729490, 21458980]

約数ペア:

[(1, 21458980), (2, 10729490), (4, 5364745), (5, 4291796), (10, 2145898), (19, 1129420), (20, 1072949), (38, 564710), (76, 282355), (95, 225884), (149, 144020), (190, 112942), (298, 72010), (379, 56620), (380, 56471), (596, 36005), (745, 28804), (758, 28310), (1490, 14402), (1516, 14155), (1895, 11324), (2831, 7580), (2980, 7201), (3790, 5662)]