20402865

素因数分解:

$3^2\times 5^1\times 7^2\times {\mathrm{19}}^1\times {\mathrm{487}}^1$

素因数の和:531

約数の個数: 72

約数和(自身を含む): 43392960

約数和(自身を除く): 22990095

約数列:

[1, 3, 5, 7, 9, 15, 19, 21, 35, 45, 49, 57, 63, 95, 105, 133, 147, 171, 245, 285, 315, 399, 441, 487, 665, 735, 855, 931, 1197, 1461, 1995, 2205, 2435, 2793, 3409, 4383, 4655, 5985, 7305, 8379, 9253, 10227, 13965, 17045, 21915, 23863, 27759, 30681, 41895, 46265, 51135, 64771, 71589, 83277, 119315, 138795, 153405, 194313, 214767, 323855, 357945, 416385, 453397, 582939, 971565, 1073835, 1360191, 2266985, 2914695, 4080573, 6800955, 20402865]

約数ペア:

[(1, 20402865), (3, 6800955), (5, 4080573), (7, 2914695), (9, 2266985), (15, 1360191), (19, 1073835), (21, 971565), (35, 582939), (45, 453397), (49, 416385), (57, 357945), (63, 323855), (95, 214767), (105, 194313), (133, 153405), (147, 138795), (171, 119315), (245, 83277), (285, 71589), (315, 64771), (399, 51135), (441, 46265), (487, 41895), (665, 30681), (735, 27759), (855, 23863), (931, 21915), (1197, 17045), (1461, 13965), (1995, 10227), (2205, 9253), (2435, 8379), (2793, 7305), (3409, 5985), (4383, 4655)]