28720251

素因数分解:

$3^4\times 7^1\times {\mathrm{37}}^3$

素因数の和:130

約数の個数: 40

約数和(自身を含む): 50394080

約数和(自身を除く): 21673829

約数列:

[1, 3, 7, 9, 21, 27, 37, 63, 81, 111, 189, 259, 333, 567, 777, 999, 1369, 2331, 2997, 4107, 6993, 9583, 12321, 20979, 28749, 36963, 50653, 86247, 110889, 151959, 258741, 354571, 455877, 776223, 1063713, 1367631, 3191139, 4102893, 9573417, 28720251]

約数ペア:

[(1, 28720251), (3, 9573417), (7, 4102893), (9, 3191139), (21, 1367631), (27, 1063713), (37, 776223), (63, 455877), (81, 354571), (111, 258741), (189, 151959), (259, 110889), (333, 86247), (567, 50653), (777, 36963), (999, 28749), (1369, 20979), (2331, 12321), (2997, 9583), (4107, 6993)]