21228885

素因数分解:

$3^4\times 5^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{53}}^1$

素因数の和:136

約数の個数: 80

約数和(自身を含む): 41399424

約数和(自身を除く): 20170539

約数列:

[1, 3, 5, 9, 15, 23, 27, 43, 45, 53, 69, 81, 115, 129, 135, 159, 207, 215, 265, 345, 387, 405, 477, 621, 645, 795, 989, 1035, 1161, 1219, 1431, 1863, 1935, 2279, 2385, 2967, 3105, 3483, 3657, 4293, 4945, 5805, 6095, 6837, 7155, 8901, 9315, 10971, 11395, 14835, 17415, 18285, 20511, 21465, 26703, 32913, 34185, 44505, 52417, 54855, 61533, 80109, 98739, 102555, 133515, 157251, 164565, 184599, 262085, 307665, 400545, 471753, 493695, 786255, 922995, 1415259, 2358765, 4245777, 7076295, 21228885]

約数ペア:

[(1, 21228885), (3, 7076295), (5, 4245777), (9, 2358765), (15, 1415259), (23, 922995), (27, 786255), (43, 493695), (45, 471753), (53, 400545), (69, 307665), (81, 262085), (115, 184599), (129, 164565), (135, 157251), (159, 133515), (207, 102555), (215, 98739), (265, 80109), (345, 61533), (387, 54855), (405, 52417), (477, 44505), (621, 34185), (645, 32913), (795, 26703), (989, 21465), (1035, 20511), (1161, 18285), (1219, 17415), (1431, 14835), (1863, 11395), (1935, 10971), (2279, 9315), (2385, 8901), (2967, 7155), (3105, 6837), (3483, 6095), (3657, 5805), (4293, 4945)]