19933775

素因数分解:

$5^2\times {\mathrm{17}}^2\times {\mathrm{31}}^1\times {\mathrm{89}}^1$

素因数の和:164

約数の個数: 36

約数和(自身を含む): 27408960

約数和(自身を除く): 7475185

約数列:

[1, 5, 17, 25, 31, 85, 89, 155, 289, 425, 445, 527, 775, 1445, 1513, 2225, 2635, 2759, 7225, 7565, 8959, 13175, 13795, 25721, 37825, 44795, 46903, 68975, 128605, 223975, 234515, 643025, 797351, 1172575, 3986755, 19933775]

約数ペア:

[(1, 19933775), (5, 3986755), (17, 1172575), (25, 797351), (31, 643025), (85, 234515), (89, 223975), (155, 128605), (289, 68975), (425, 46903), (445, 44795), (527, 37825), (775, 25721), (1445, 13795), (1513, 13175), (2225, 8959), (2635, 7565), (2759, 7225)]