21490980

素因数分解:

$2^2\times 3^1\times 5^1\times 7^1\times {\mathrm{51169}}^1$

素因数の和:51188

約数の個数: 48

約数和(自身を含む): 68772480

約数和(自身を除く): 47281500

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420, 51169, 102338, 153507, 204676, 255845, 307014, 358183, 511690, 614028, 716366, 767535, 1023380, 1074549, 1432732, 1535070, 1790915, 2149098, 3070140, 3581830, 4298196, 5372745, 7163660, 10745490, 21490980]

約数ペア:

[(1, 21490980), (2, 10745490), (3, 7163660), (4, 5372745), (5, 4298196), (6, 3581830), (7, 3070140), (10, 2149098), (12, 1790915), (14, 1535070), (15, 1432732), (20, 1074549), (21, 1023380), (28, 767535), (30, 716366), (35, 614028), (42, 511690), (60, 358183), (70, 307014), (84, 255845), (105, 204676), (140, 153507), (210, 102338), (420, 51169)]