21253180

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{1901}}^1$

素因数の和:1966

約数の個数: 48

約数和(自身を含む): 49208544

約数和(自身を除く): 27955364

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 43, 52, 65, 86, 130, 172, 215, 260, 430, 559, 860, 1118, 1901, 2236, 2795, 3802, 5590, 7604, 9505, 11180, 19010, 24713, 38020, 49426, 81743, 98852, 123565, 163486, 247130, 326972, 408715, 494260, 817430, 1062659, 1634860, 2125318, 4250636, 5313295, 10626590, 21253180]

約数ペア:

[(1, 21253180), (2, 10626590), (4, 5313295), (5, 4250636), (10, 2125318), (13, 1634860), (20, 1062659), (26, 817430), (43, 494260), (52, 408715), (65, 326972), (86, 247130), (130, 163486), (172, 123565), (215, 98852), (260, 81743), (430, 49426), (559, 38020), (860, 24713), (1118, 19010), (1901, 11180), (2236, 9505), (2795, 7604), (3802, 5590)]