21212520

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{25253}}^1$

素因数の和:25274

約数の個数: 64

約数和(自身を含む): 72731520

約数和(自身を除く): 51519000

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840, 25253, 50506, 75759, 101012, 126265, 151518, 176771, 202024, 252530, 303036, 353542, 378795, 505060, 530313, 606072, 707084, 757590, 883855, 1010120, 1060626, 1414168, 1515180, 1767710, 2121252, 2651565, 3030360, 3535420, 4242504, 5303130, 7070840, 10606260, 21212520]

約数ペア:

[(1, 21212520), (2, 10606260), (3, 7070840), (4, 5303130), (5, 4242504), (6, 3535420), (7, 3030360), (8, 2651565), (10, 2121252), (12, 1767710), (14, 1515180), (15, 1414168), (20, 1060626), (21, 1010120), (24, 883855), (28, 757590), (30, 707084), (35, 606072), (40, 530313), (42, 505060), (56, 378795), (60, 353542), (70, 303036), (84, 252530), (105, 202024), (120, 176771), (140, 151518), (168, 126265), (210, 101012), (280, 75759), (420, 50506), (840, 25253)]