21298340

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{103}}^1\times {\mathrm{211}}^1$

素因数の和:337

約数の個数: 72

約数和(自身を含む): 52782912

約数和(自身を除く): 31484572

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 103, 140, 196, 206, 211, 245, 412, 422, 490, 515, 721, 844, 980, 1030, 1055, 1442, 1477, 2060, 2110, 2884, 2954, 3605, 4220, 5047, 5908, 7210, 7385, 10094, 10339, 14420, 14770, 20188, 20678, 21733, 25235, 29540, 41356, 43466, 50470, 51695, 86932, 100940, 103390, 108665, 152131, 206780, 217330, 304262, 434660, 608524, 760655, 1064917, 1521310, 2129834, 3042620, 4259668, 5324585, 10649170, 21298340]

約数ペア:

[(1, 21298340), (2, 10649170), (4, 5324585), (5, 4259668), (7, 3042620), (10, 2129834), (14, 1521310), (20, 1064917), (28, 760655), (35, 608524), (49, 434660), (70, 304262), (98, 217330), (103, 206780), (140, 152131), (196, 108665), (206, 103390), (211, 100940), (245, 86932), (412, 51695), (422, 50470), (490, 43466), (515, 41356), (721, 29540), (844, 25235), (980, 21733), (1030, 20678), (1055, 20188), (1442, 14770), (1477, 14420), (2060, 10339), (2110, 10094), (2884, 7385), (2954, 7210), (3605, 5908), (4220, 5047)]