20117825

素因数分解:

$5^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{239}}^1$

素因数の和:306

約数の個数: 48

約数和(自身を含む): 31664640

約数和(自身を除く): 11546815

約数列:

[1, 5, 7, 13, 25, 35, 37, 65, 91, 175, 185, 239, 259, 325, 455, 481, 925, 1195, 1295, 1673, 2275, 2405, 3107, 3367, 5975, 6475, 8365, 8843, 12025, 15535, 16835, 21749, 41825, 44215, 61901, 77675, 84175, 108745, 114959, 221075, 309505, 543725, 574795, 804713, 1547525, 2873975, 4023565, 20117825]

約数ペア:

[(1, 20117825), (5, 4023565), (7, 2873975), (13, 1547525), (25, 804713), (35, 574795), (37, 543725), (65, 309505), (91, 221075), (175, 114959), (185, 108745), (239, 84175), (259, 77675), (325, 61901), (455, 44215), (481, 41825), (925, 21749), (1195, 16835), (1295, 15535), (1673, 12025), (2275, 8843), (2405, 8365), (3107, 6475), (3367, 5975)]