21959860

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{73}}^1\times {\mathrm{89}}^1$

素因数の和:197

約数の個数: 72

約数和(自身を含む): 51188760

約数和(自身を除く): 29228900

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 73, 89, 130, 146, 169, 178, 260, 292, 338, 356, 365, 445, 676, 730, 845, 890, 949, 1157, 1460, 1690, 1780, 1898, 2314, 3380, 3796, 4628, 4745, 5785, 6497, 9490, 11570, 12337, 12994, 15041, 18980, 23140, 24674, 25988, 30082, 32485, 49348, 60164, 61685, 64970, 75205, 84461, 123370, 129940, 150410, 168922, 246740, 300820, 337844, 422305, 844610, 1097993, 1689220, 2195986, 4391972, 5489965, 10979930, 21959860]

約数ペア:

[(1, 21959860), (2, 10979930), (4, 5489965), (5, 4391972), (10, 2195986), (13, 1689220), (20, 1097993), (26, 844610), (52, 422305), (65, 337844), (73, 300820), (89, 246740), (130, 168922), (146, 150410), (169, 129940), (178, 123370), (260, 84461), (292, 75205), (338, 64970), (356, 61685), (365, 60164), (445, 49348), (676, 32485), (730, 30082), (845, 25988), (890, 24674), (949, 23140), (1157, 18980), (1460, 15041), (1690, 12994), (1780, 12337), (1898, 11570), (2314, 9490), (3380, 6497), (3796, 5785), (4628, 4745)]