21282920

素因数分解:

$2^3\times 5^1\times {\mathrm{157}}^1\times {\mathrm{3389}}^1$

素因数の和:3557

約数の個数: 32

約数和(自身を含む): 48205800

約数和(自身を除く): 26922880

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 157, 314, 628, 785, 1256, 1570, 3140, 3389, 6280, 6778, 13556, 16945, 27112, 33890, 67780, 135560, 532073, 1064146, 2128292, 2660365, 4256584, 5320730, 10641460, 21282920]

約数ペア:

[(1, 21282920), (2, 10641460), (4, 5320730), (5, 4256584), (8, 2660365), (10, 2128292), (20, 1064146), (40, 532073), (157, 135560), (314, 67780), (628, 33890), (785, 27112), (1256, 16945), (1570, 13556), (3140, 6778), (3389, 6280)]