21157890

素因数分解:

$2^1\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{54251}}^1$

素因数の和:54274

約数の個数: 32

約数和(自身を含む): 54686016

約数和(自身を除く): 33528126

約数列:

[1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 195, 390, 54251, 108502, 162753, 271255, 325506, 542510, 705263, 813765, 1410526, 1627530, 2115789, 3526315, 4231578, 7052630, 10578945, 21157890]

約数ペア:

[(1, 21157890), (2, 10578945), (3, 7052630), (5, 4231578), (6, 3526315), (10, 2115789), (13, 1627530), (15, 1410526), (26, 813765), (30, 705263), (39, 542510), (65, 325506), (78, 271255), (130, 162753), (195, 108502), (390, 54251)]