20979405

素因数分解:

$3^5\times 5^1\times {\mathrm{31}}^1\times {\mathrm{557}}^1$

素因数の和:608

約数の個数: 48

約数和(自身を含む): 38997504

約数和(自身を除く): 18018099

約数列:

[1, 3, 5, 9, 15, 27, 31, 45, 81, 93, 135, 155, 243, 279, 405, 465, 557, 837, 1215, 1395, 1671, 2511, 2785, 4185, 5013, 7533, 8355, 12555, 15039, 17267, 25065, 37665, 45117, 51801, 75195, 86335, 135351, 155403, 225585, 259005, 466209, 676755, 777015, 1398627, 2331045, 4195881, 6993135, 20979405]

約数ペア:

[(1, 20979405), (3, 6993135), (5, 4195881), (9, 2331045), (15, 1398627), (27, 777015), (31, 676755), (45, 466209), (81, 259005), (93, 225585), (135, 155403), (155, 135351), (243, 86335), (279, 75195), (405, 51801), (465, 45117), (557, 37665), (837, 25065), (1215, 17267), (1395, 15039), (1671, 12555), (2511, 8355), (2785, 7533), (4185, 5013)]