21296015

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{61}}^1\times {\mathrm{131}}^1$

素因数の和:251

約数の個数: 32

約数和(自身を含む): 28873152

約数和(自身を除く): 7577137

約数列:

[1, 5, 13, 41, 61, 65, 131, 205, 305, 533, 655, 793, 1703, 2501, 2665, 3965, 5371, 7991, 8515, 12505, 26855, 32513, 39955, 69823, 103883, 162565, 327631, 349115, 519415, 1638155, 4259203, 21296015]

約数ペア:

[(1, 21296015), (5, 4259203), (13, 1638155), (41, 519415), (61, 349115), (65, 327631), (131, 162565), (205, 103883), (305, 69823), (533, 39955), (655, 32513), (793, 26855), (1703, 12505), (2501, 8515), (2665, 7991), (3965, 5371)]