20986745

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{67}}^1\times {\mathrm{79}}^1$

素因数の和:225

約数の個数: 32

約数和(自身を含む): 28331520

約数和(自身を除く): 7344775

約数列:

[1, 5, 13, 61, 65, 67, 79, 305, 335, 395, 793, 871, 1027, 3965, 4087, 4355, 4819, 5135, 5293, 20435, 24095, 26465, 53131, 62647, 68809, 265655, 313235, 322873, 344045, 1614365, 4197349, 20986745]

約数ペア:

[(1, 20986745), (5, 4197349), (13, 1614365), (61, 344045), (65, 322873), (67, 313235), (79, 265655), (305, 68809), (335, 62647), (395, 53131), (793, 26465), (871, 24095), (1027, 20435), (3965, 5293), (4087, 5135), (4355, 4819)]