21102389

素因数分解:

$7^4\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1$

素因数の和:103

約数の個数: 40

約数和(自身を含む): 29040768

約数和(自身を除く): 7938379

約数列:

[1, 7, 11, 17, 47, 49, 77, 119, 187, 329, 343, 517, 539, 799, 833, 1309, 2303, 2401, 3619, 3773, 5593, 5831, 8789, 9163, 16121, 25333, 26411, 39151, 40817, 61523, 64141, 112847, 177331, 274057, 430661, 448987, 1241317, 1918399, 3014627, 21102389]

約数ペア:

[(1, 21102389), (7, 3014627), (11, 1918399), (17, 1241317), (47, 448987), (49, 430661), (77, 274057), (119, 177331), (187, 112847), (329, 64141), (343, 61523), (517, 40817), (539, 39151), (799, 26411), (833, 25333), (1309, 16121), (2303, 9163), (2401, 8789), (3619, 5831), (3773, 5593)]