21235540

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{41}}^1\times {\mathrm{47}}^1$

素因数の和:145

約数の個数: 96

約数和(自身を含む): 50803200

約数和(自身を除く): 29567660

約数列:

[1, 2, 4, 5, 10, 19, 20, 29, 38, 41, 47, 58, 76, 82, 94, 95, 116, 145, 164, 188, 190, 205, 235, 290, 380, 410, 470, 551, 580, 779, 820, 893, 940, 1102, 1189, 1363, 1558, 1786, 1927, 2204, 2378, 2726, 2755, 3116, 3572, 3854, 3895, 4465, 4756, 5452, 5510, 5945, 6815, 7708, 7790, 8930, 9635, 11020, 11890, 13630, 15580, 17860, 19270, 22591, 23780, 25897, 27260, 36613, 38540, 45182, 51794, 55883, 73226, 90364, 103588, 111766, 112955, 129485, 146452, 183065, 223532, 225910, 258970, 279415, 366130, 451820, 517940, 558830, 732260, 1061777, 1117660, 2123554, 4247108, 5308885, 10617770, 21235540]

約数ペア:

[(1, 21235540), (2, 10617770), (4, 5308885), (5, 4247108), (10, 2123554), (19, 1117660), (20, 1061777), (29, 732260), (38, 558830), (41, 517940), (47, 451820), (58, 366130), (76, 279415), (82, 258970), (94, 225910), (95, 223532), (116, 183065), (145, 146452), (164, 129485), (188, 112955), (190, 111766), (205, 103588), (235, 90364), (290, 73226), (380, 55883), (410, 51794), (470, 45182), (551, 38540), (580, 36613), (779, 27260), (820, 25897), (893, 23780), (940, 22591), (1102, 19270), (1189, 17860), (1363, 15580), (1558, 13630), (1786, 11890), (1927, 11020), (2204, 9635), (2378, 8930), (2726, 7790), (2755, 7708), (3116, 6815), (3572, 5945), (3854, 5510), (3895, 5452), (4465, 4756)]