20457788

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{53}}^1\times {\mathrm{571}}^1$

素因数の和:654

約数の個数: 36

約数和(自身を含む): 39567528

約数和(自身を除く): 19109740

約数列:

[1, 2, 4, 13, 26, 52, 53, 106, 169, 212, 338, 571, 676, 689, 1142, 1378, 2284, 2756, 7423, 8957, 14846, 17914, 29692, 30263, 35828, 60526, 96499, 121052, 192998, 385996, 393419, 786838, 1573676, 5114447, 10228894, 20457788]

約数ペア:

[(1, 20457788), (2, 10228894), (4, 5114447), (13, 1573676), (26, 786838), (52, 393419), (53, 385996), (106, 192998), (169, 121052), (212, 96499), (338, 60526), (571, 35828), (676, 30263), (689, 29692), (1142, 17914), (1378, 14846), (2284, 8957), (2756, 7423)]