21903245

素因数分解:

$5^1\times 7^2\times {\mathrm{13}}^2\times {\mathrm{23}}^2$

素因数の和:91

約数の個数: 54

約数和(自身を含む): 34610058

約数和(自身を除く): 12706813

約数列:

[1, 5, 7, 13, 23, 35, 49, 65, 91, 115, 161, 169, 245, 299, 455, 529, 637, 805, 845, 1127, 1183, 1495, 2093, 2645, 3185, 3703, 3887, 5635, 5915, 6877, 8281, 10465, 14651, 18515, 19435, 25921, 27209, 34385, 41405, 48139, 73255, 89401, 129605, 136045, 190463, 240695, 336973, 447005, 625807, 952315, 1684865, 3129035, 4380649, 21903245]

約数ペア:

[(1, 21903245), (5, 4380649), (7, 3129035), (13, 1684865), (23, 952315), (35, 625807), (49, 447005), (65, 336973), (91, 240695), (115, 190463), (161, 136045), (169, 129605), (245, 89401), (299, 73255), (455, 48139), (529, 41405), (637, 34385), (805, 27209), (845, 25921), (1127, 19435), (1183, 18515), (1495, 14651), (2093, 10465), (2645, 8281), (3185, 6877), (3703, 5915), (3887, 5635)]