21506520

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{25603}}^1$

素因数の和:25624

約数の個数: 64

約数和(自身を含む): 73739520

約数和(自身を除く): 52233000

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, 25603, 51206, 76809, 102412, 128015, 153618, 179221, 204824, 256030, 307236, 358442, 384045, 512060, 537663, 614472, 716884, 768090, 896105, 1024120, 1075326, 1433768, 1536180, 1792210, 2150652, 2688315, 3072360, 3584420, 4301304, 5376630, 7168840, 10753260, 21506520]

約数ペア:

[(1, 21506520), (2, 10753260), (3, 7168840), (4, 5376630), (5, 4301304), (6, 3584420), (7, 3072360), (8, 2688315), (10, 2150652), (12, 1792210), (14, 1536180), (15, 1433768), (20, 1075326), (21, 1024120), (24, 896105), (28, 768090), (30, 716884), (35, 614472), (40, 537663), (42, 512060), (56, 384045), (60, 358442), (70, 307236), (84, 256030), (105, 204824), (120, 179221), (140, 153618), (168, 128015), (210, 102412), (280, 76809), (420, 51206), (840, 25603)]