20661340

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{29}}^1\times {\mathrm{727}}^1$

素因数の和:779

約数の個数: 72

約数和(自身を含む): 52284960

約数和(自身を除く): 31623620

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 29, 35, 49, 58, 70, 98, 116, 140, 145, 196, 203, 245, 290, 406, 490, 580, 727, 812, 980, 1015, 1421, 1454, 2030, 2842, 2908, 3635, 4060, 5089, 5684, 7105, 7270, 10178, 14210, 14540, 20356, 21083, 25445, 28420, 35623, 42166, 50890, 71246, 84332, 101780, 105415, 142492, 147581, 178115, 210830, 295162, 356230, 421660, 590324, 712460, 737905, 1033067, 1475810, 2066134, 2951620, 4132268, 5165335, 10330670, 20661340]

約数ペア:

[(1, 20661340), (2, 10330670), (4, 5165335), (5, 4132268), (7, 2951620), (10, 2066134), (14, 1475810), (20, 1033067), (28, 737905), (29, 712460), (35, 590324), (49, 421660), (58, 356230), (70, 295162), (98, 210830), (116, 178115), (140, 147581), (145, 142492), (196, 105415), (203, 101780), (245, 84332), (290, 71246), (406, 50890), (490, 42166), (580, 35623), (727, 28420), (812, 25445), (980, 21083), (1015, 20356), (1421, 14540), (1454, 14210), (2030, 10178), (2842, 7270), (2908, 7105), (3635, 5684), (4060, 5089)]