21813155

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{191}}^1\times {\mathrm{251}}^1$

素因数の和:467

約数の個数: 32

約数和(自身を含む): 32514048

約数和(自身を除く): 10700893

約数列:

[1, 5, 7, 13, 35, 65, 91, 191, 251, 455, 955, 1255, 1337, 1757, 2483, 3263, 6685, 8785, 12415, 16315, 17381, 22841, 47941, 86905, 114205, 239705, 335587, 623233, 1677935, 3116165, 4362631, 21813155]

約数ペア:

[(1, 21813155), (5, 4362631), (7, 3116165), (13, 1677935), (35, 623233), (65, 335587), (91, 239705), (191, 114205), (251, 86905), (455, 47941), (955, 22841), (1255, 17381), (1337, 16315), (1757, 12415), (2483, 8785), (3263, 6685)]