21638820

素因数分解:

$2^2\times 3^1\times 5^1\times 7^1\times {\mathrm{51521}}^1$

素因数の和:51540

約数の個数: 48

約数和(自身を含む): 69245568

約数和(自身を除く): 47606748

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420, 51521, 103042, 154563, 206084, 257605, 309126, 360647, 515210, 618252, 721294, 772815, 1030420, 1081941, 1442588, 1545630, 1803235, 2163882, 3091260, 3606470, 4327764, 5409705, 7212940, 10819410, 21638820]

約数ペア:

[(1, 21638820), (2, 10819410), (3, 7212940), (4, 5409705), (5, 4327764), (6, 3606470), (7, 3091260), (10, 2163882), (12, 1803235), (14, 1545630), (15, 1442588), (20, 1081941), (21, 1030420), (28, 772815), (30, 721294), (35, 618252), (42, 515210), (60, 360647), (70, 309126), (84, 257605), (105, 206084), (140, 154563), (210, 103042), (420, 51521)]