20813975

素因数分解:

$5^2\times 7^2\times {\mathrm{13}}^1\times {\mathrm{1307}}^1$

素因数の和:1344

約数の個数: 36

約数和(自身を含む): 32357304

約数和(自身を除く): 11543329

約数列:

[1, 5, 7, 13, 25, 35, 49, 65, 91, 175, 245, 325, 455, 637, 1225, 1307, 2275, 3185, 6535, 9149, 15925, 16991, 32675, 45745, 64043, 84955, 118937, 228725, 320215, 424775, 594685, 832559, 1601075, 2973425, 4162795, 20813975]

約数ペア:

[(1, 20813975), (5, 4162795), (7, 2973425), (13, 1601075), (25, 832559), (35, 594685), (49, 424775), (65, 320215), (91, 228725), (175, 118937), (245, 84955), (325, 64043), (455, 45745), (637, 32675), (1225, 16991), (1307, 15925), (2275, 9149), (3185, 6535)]