19901790

素因数分解:

$2^1\times 3^2\times 5^1\times {\mathrm{251}}^1\times {\mathrm{881}}^1$

素因数の和:1145

約数の個数: 48

約数和(自身を含む): 52009776

約数和(自身を除く): 32107986

約数列:

[1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90, 251, 502, 753, 881, 1255, 1506, 1762, 2259, 2510, 2643, 3765, 4405, 4518, 5286, 7530, 7929, 8810, 11295, 13215, 15858, 22590, 26430, 39645, 79290, 221131, 442262, 663393, 1105655, 1326786, 1990179, 2211310, 3316965, 3980358, 6633930, 9950895, 19901790]

約数ペア:

[(1, 19901790), (2, 9950895), (3, 6633930), (5, 3980358), (6, 3316965), (9, 2211310), (10, 1990179), (15, 1326786), (18, 1105655), (30, 663393), (45, 442262), (90, 221131), (251, 79290), (502, 39645), (753, 26430), (881, 22590), (1255, 15858), (1506, 13215), (1762, 11295), (2259, 8810), (2510, 7929), (2643, 7530), (3765, 5286), (4405, 4518)]