21378220

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^2\times {\mathrm{31}}^1\times {\mathrm{41}}^1$

素因数の和:139

約数の個数: 72

約数和(自身を含む): 49166208

約数和(自身を除く): 27787988

約数列:

[1, 2, 4, 5, 10, 20, 29, 31, 41, 58, 62, 82, 116, 124, 145, 155, 164, 205, 290, 310, 410, 580, 620, 820, 841, 899, 1189, 1271, 1682, 1798, 2378, 2542, 3364, 3596, 4205, 4495, 4756, 5084, 5945, 6355, 8410, 8990, 11890, 12710, 16820, 17980, 23780, 25420, 26071, 34481, 36859, 52142, 68962, 73718, 104284, 130355, 137924, 147436, 172405, 184295, 260710, 344810, 368590, 521420, 689620, 737180, 1068911, 2137822, 4275644, 5344555, 10689110, 21378220]

約数ペア:

[(1, 21378220), (2, 10689110), (4, 5344555), (5, 4275644), (10, 2137822), (20, 1068911), (29, 737180), (31, 689620), (41, 521420), (58, 368590), (62, 344810), (82, 260710), (116, 184295), (124, 172405), (145, 147436), (155, 137924), (164, 130355), (205, 104284), (290, 73718), (310, 68962), (410, 52142), (580, 36859), (620, 34481), (820, 26071), (841, 25420), (899, 23780), (1189, 17980), (1271, 16820), (1682, 12710), (1798, 11890), (2378, 8990), (2542, 8410), (3364, 6355), (3596, 5945), (4205, 5084), (4495, 4756)]