21237920

素因数分解:

$2^5\times 5^1\times {\mathrm{11}}^2\times {\mathrm{1097}}^1$

素因数の和:1134

約数の個数: 72

約数和(自身を含む): 55200852

約数和(自身を除く): 33962932

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 32, 40, 44, 55, 80, 88, 110, 121, 160, 176, 220, 242, 352, 440, 484, 605, 880, 968, 1097, 1210, 1760, 1936, 2194, 2420, 3872, 4388, 4840, 5485, 8776, 9680, 10970, 12067, 17552, 19360, 21940, 24134, 35104, 43880, 48268, 60335, 87760, 96536, 120670, 132737, 175520, 193072, 241340, 265474, 386144, 482680, 530948, 663685, 965360, 1061896, 1327370, 1930720, 2123792, 2654740, 4247584, 5309480, 10618960, 21237920]

約数ペア:

[(1, 21237920), (2, 10618960), (4, 5309480), (5, 4247584), (8, 2654740), (10, 2123792), (11, 1930720), (16, 1327370), (20, 1061896), (22, 965360), (32, 663685), (40, 530948), (44, 482680), (55, 386144), (80, 265474), (88, 241340), (110, 193072), (121, 175520), (160, 132737), (176, 120670), (220, 96536), (242, 87760), (352, 60335), (440, 48268), (484, 43880), (605, 35104), (880, 24134), (968, 21940), (1097, 19360), (1210, 17552), (1760, 12067), (1936, 10970), (2194, 9680), (2420, 8776), (3872, 5485), (4388, 4840)]