21000201705

素因数分解:

$3^2\times 5^1\times 7^2\times {\mathrm{2351}}^1\times {\mathrm{4051}}^1$

素因数の和:6427

約数の個数: 72

約数和(自身を含む): 42371731584

約数和(自身を除く): 21371529879

約数列:

[1, 3, 5, 7, 9, 15, 21, 35, 45, 49, 63, 105, 147, 245, 315, 441, 735, 2205, 2351, 4051, 7053, 11755, 12153, 16457, 20255, 21159, 28357, 35265, 36459, 49371, 60765, 82285, 85071, 105795, 115199, 141785, 148113, 182295, 198499, 246855, 255213, 345597, 425355, 575995, 595497, 740565, 992495, 1036791, 1276065, 1727985, 1786491, 2977485, 5183955, 8932455, 9523901, 28571703, 47619505, 66667307, 85715109, 142858515, 200001921, 333336535, 428575545, 466671149, 600005763, 1000009605, 1400013447, 2333355745, 3000028815, 4200040341, 7000067235, 21000201705]

約数ペア:

[(1, 21000201705), (3, 7000067235), (5, 4200040341), (7, 3000028815), (9, 2333355745), (15, 1400013447), (21, 1000009605), (35, 600005763), (45, 466671149), (49, 428575545), (63, 333336535), (105, 200001921), (147, 142858515), (245, 85715109), (315, 66667307), (441, 47619505), (735, 28571703), (2205, 9523901), (2351, 8932455), (4051, 5183955), (7053, 2977485), (11755, 1786491), (12153, 1727985), (16457, 1276065), (20255, 1036791), (21159, 992495), (28357, 740565), (35265, 595497), (36459, 575995), (49371, 425355), (60765, 345597), (82285, 255213), (85071, 246855), (105795, 198499), (115199, 182295), (141785, 148113)]