20406940

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{61}}^1\times {\mathrm{389}}^1$

素因数の和:502

約数の個数: 48

約数和(自身を含む): 44684640

約数和(自身を除く): 24277700

約数列:

[1, 2, 4, 5, 10, 20, 43, 61, 86, 122, 172, 215, 244, 305, 389, 430, 610, 778, 860, 1220, 1556, 1945, 2623, 3890, 5246, 7780, 10492, 13115, 16727, 23729, 26230, 33454, 47458, 52460, 66908, 83635, 94916, 118645, 167270, 237290, 334540, 474580, 1020347, 2040694, 4081388, 5101735, 10203470, 20406940]

約数ペア:

[(1, 20406940), (2, 10203470), (4, 5101735), (5, 4081388), (10, 2040694), (20, 1020347), (43, 474580), (61, 334540), (86, 237290), (122, 167270), (172, 118645), (215, 94916), (244, 83635), (305, 66908), (389, 52460), (430, 47458), (610, 33454), (778, 26230), (860, 23729), (1220, 16727), (1556, 13115), (1945, 10492), (2623, 7780), (3890, 5246)]