19995664

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{251}}^1\times {\mathrm{383}}^1$

素因数の和:655

約数の個数: 40

約数和(自身を含む): 41997312

約数和(自身を除く): 22001648

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 251, 383, 502, 766, 1004, 1532, 2008, 3064, 3263, 4016, 4979, 6128, 6526, 9958, 13052, 19916, 26104, 39832, 52208, 79664, 96133, 192266, 384532, 769064, 1249729, 1538128, 2499458, 4998916, 9997832, 19995664]

約数ペア:

[(1, 19995664), (2, 9997832), (4, 4998916), (8, 2499458), (13, 1538128), (16, 1249729), (26, 769064), (52, 384532), (104, 192266), (208, 96133), (251, 79664), (383, 52208), (502, 39832), (766, 26104), (1004, 19916), (1532, 13052), (2008, 9958), (3064, 6526), (3263, 6128), (4016, 4979)]