81317680

素因数分解:

$2^4\times 5^1\times {\mathrm{521}}^1\times {\mathrm{1951}}^1$

素因数の和:2485

約数の個数: 40

約数和(自身を含む): 189523584

約数和(自身を除く): 108205904

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 521, 1042, 1951, 2084, 2605, 3902, 4168, 5210, 7804, 8336, 9755, 10420, 15608, 19510, 20840, 31216, 39020, 41680, 78040, 156080, 1016471, 2032942, 4065884, 5082355, 8131768, 10164710, 16263536, 20329420, 40658840, 81317680]

約数ペア:

[(1, 81317680), (2, 40658840), (4, 20329420), (5, 16263536), (8, 10164710), (10, 8131768), (16, 5082355), (20, 4065884), (40, 2032942), (80, 1016471), (521, 156080), (1042, 78040), (1951, 41680), (2084, 39020), (2605, 31216), (3902, 20840), (4168, 19510), (5210, 15608), (7804, 10420), (8336, 9755)]