19981390

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{157}}^1$

素因数の和:277

約数の個数: 64

約数和(自身を含む): 43001280

約数和(自身を除く): 23019890

約数列:

[1, 2, 5, 10, 11, 13, 22, 26, 55, 65, 89, 110, 130, 143, 157, 178, 286, 314, 445, 715, 785, 890, 979, 1157, 1430, 1570, 1727, 1958, 2041, 2314, 3454, 4082, 4895, 5785, 8635, 9790, 10205, 11570, 12727, 13973, 17270, 20410, 22451, 25454, 27946, 44902, 63635, 69865, 112255, 127270, 139730, 153703, 181649, 224510, 307406, 363298, 768515, 908245, 1537030, 1816490, 1998139, 3996278, 9990695, 19981390]

約数ペア:

[(1, 19981390), (2, 9990695), (5, 3996278), (10, 1998139), (11, 1816490), (13, 1537030), (22, 908245), (26, 768515), (55, 363298), (65, 307406), (89, 224510), (110, 181649), (130, 153703), (143, 139730), (157, 127270), (178, 112255), (286, 69865), (314, 63635), (445, 44902), (715, 27946), (785, 25454), (890, 22451), (979, 20410), (1157, 17270), (1430, 13973), (1570, 12727), (1727, 11570), (1958, 10205), (2041, 9790), (2314, 8635), (3454, 5785), (4082, 4895)]