21531520

素因数分解:

$2^7\times 5^1\times {\mathrm{17}}^1\times {\mathrm{1979}}^1$

素因数の和:2015

約数の個数: 64

約数和(自身を含む): 54529200

約数和(自身を除く): 32997680

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 40, 64, 68, 80, 85, 128, 136, 160, 170, 272, 320, 340, 544, 640, 680, 1088, 1360, 1979, 2176, 2720, 3958, 5440, 7916, 9895, 10880, 15832, 19790, 31664, 33643, 39580, 63328, 67286, 79160, 126656, 134572, 158320, 168215, 253312, 269144, 316640, 336430, 538288, 633280, 672860, 1076576, 1266560, 1345720, 2153152, 2691440, 4306304, 5382880, 10765760, 21531520]

約数ペア:

[(1, 21531520), (2, 10765760), (4, 5382880), (5, 4306304), (8, 2691440), (10, 2153152), (16, 1345720), (17, 1266560), (20, 1076576), (32, 672860), (34, 633280), (40, 538288), (64, 336430), (68, 316640), (80, 269144), (85, 253312), (128, 168215), (136, 158320), (160, 134572), (170, 126656), (272, 79160), (320, 67286), (340, 63328), (544, 39580), (640, 33643), (680, 31664), (1088, 19790), (1360, 15832), (1979, 10880), (2176, 9895), (2720, 7916), (3958, 5440)]