21980840

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{29}}^1\times {\mathrm{2707}}^1$

素因数の和:2754

約数の個数: 64

約数和(自身を含む): 58492800

約数和(自身を除く): 36511960

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 29, 35, 40, 56, 58, 70, 116, 140, 145, 203, 232, 280, 290, 406, 580, 812, 1015, 1160, 1624, 2030, 2707, 4060, 5414, 8120, 10828, 13535, 18949, 21656, 27070, 37898, 54140, 75796, 78503, 94745, 108280, 151592, 157006, 189490, 314012, 378980, 392515, 549521, 628024, 757960, 785030, 1099042, 1570060, 2198084, 2747605, 3140120, 4396168, 5495210, 10990420, 21980840]

約数ペア:

[(1, 21980840), (2, 10990420), (4, 5495210), (5, 4396168), (7, 3140120), (8, 2747605), (10, 2198084), (14, 1570060), (20, 1099042), (28, 785030), (29, 757960), (35, 628024), (40, 549521), (56, 392515), (58, 378980), (70, 314012), (116, 189490), (140, 157006), (145, 151592), (203, 108280), (232, 94745), (280, 78503), (290, 75796), (406, 54140), (580, 37898), (812, 27070), (1015, 21656), (1160, 18949), (1624, 13535), (2030, 10828), (2707, 8120), (4060, 5414)]