21491535

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{307}}^1\times {\mathrm{359}}^1$

素因数の和:687

約数の個数: 32

約数和(自身を含む): 37255680

約数和(自身を除く): 15764145

約数列:

[1, 3, 5, 13, 15, 39, 65, 195, 307, 359, 921, 1077, 1535, 1795, 3991, 4605, 4667, 5385, 11973, 14001, 19955, 23335, 59865, 70005, 110213, 330639, 551065, 1432769, 1653195, 4298307, 7163845, 21491535]

約数ペア:

[(1, 21491535), (3, 7163845), (5, 4298307), (13, 1653195), (15, 1432769), (39, 551065), (65, 330639), (195, 110213), (307, 70005), (359, 59865), (921, 23335), (1077, 19955), (1535, 14001), (1795, 11973), (3991, 5385), (4605, 4667)]