21235825

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{19}}^2\times {\mathrm{181}}^1$

素因数の和:242

約数の個数: 36

約数和(自身を含む): 30094428

約数和(自身を除く): 8858603

約数列:

[1, 5, 13, 19, 25, 65, 95, 181, 247, 325, 361, 475, 905, 1235, 1805, 2353, 3439, 4525, 4693, 6175, 9025, 11765, 17195, 23465, 44707, 58825, 65341, 85975, 117325, 223535, 326705, 849433, 1117675, 1633525, 4247165, 21235825]

約数ペア:

[(1, 21235825), (5, 4247165), (13, 1633525), (19, 1117675), (25, 849433), (65, 326705), (95, 223535), (181, 117325), (247, 85975), (325, 65341), (361, 58825), (475, 44707), (905, 23465), (1235, 17195), (1805, 11765), (2353, 9025), (3439, 6175), (4525, 4693)]