21031780

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{1951}}^1$

素因数の和:1985

約数の個数: 72

約数和(自身を含む): 56077056

約数和(自身を除く): 35045276

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 49, 55, 70, 77, 98, 110, 140, 154, 196, 220, 245, 308, 385, 490, 539, 770, 980, 1078, 1540, 1951, 2156, 2695, 3902, 5390, 7804, 9755, 10780, 13657, 19510, 21461, 27314, 39020, 42922, 54628, 68285, 85844, 95599, 107305, 136570, 150227, 191198, 214610, 273140, 300454, 382396, 429220, 477995, 600908, 751135, 955990, 1051589, 1502270, 1911980, 2103178, 3004540, 4206356, 5257945, 10515890, 21031780]

約数ペア:

[(1, 21031780), (2, 10515890), (4, 5257945), (5, 4206356), (7, 3004540), (10, 2103178), (11, 1911980), (14, 1502270), (20, 1051589), (22, 955990), (28, 751135), (35, 600908), (44, 477995), (49, 429220), (55, 382396), (70, 300454), (77, 273140), (98, 214610), (110, 191198), (140, 150227), (154, 136570), (196, 107305), (220, 95599), (245, 85844), (308, 68285), (385, 54628), (490, 42922), (539, 39020), (770, 27314), (980, 21461), (1078, 19510), (1540, 13657), (1951, 10780), (2156, 9755), (2695, 7804), (3902, 5390)]