21501620

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{383}}^1\times {\mathrm{401}}^1$

素因数の和:800

約数の個数: 48

約数和(自身を含む): 51867648

約数和(自身を除く): 30366028

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 383, 401, 766, 802, 1532, 1604, 1915, 2005, 2681, 2807, 3830, 4010, 5362, 5614, 7660, 8020, 10724, 11228, 13405, 14035, 26810, 28070, 53620, 56140, 153583, 307166, 614332, 767915, 1075081, 1535830, 2150162, 3071660, 4300324, 5375405, 10750810, 21501620]

約数ペア:

[(1, 21501620), (2, 10750810), (4, 5375405), (5, 4300324), (7, 3071660), (10, 2150162), (14, 1535830), (20, 1075081), (28, 767915), (35, 614332), (70, 307166), (140, 153583), (383, 56140), (401, 53620), (766, 28070), (802, 26810), (1532, 14035), (1604, 13405), (1915, 11228), (2005, 10724), (2681, 8020), (2807, 7660), (3830, 5614), (4010, 5362)]