21890820

素因数分解:

$2^2\times 3^1\times 5^1\times 7^1\times {\mathrm{52121}}^1$

素因数の和:52140

約数の個数: 48

約数和(自身を含む): 70051968

約数和(自身を除く): 48161148

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, 52121, 104242, 156363, 208484, 260605, 312726, 364847, 521210, 625452, 729694, 781815, 1042420, 1094541, 1459388, 1563630, 1824235, 2189082, 3127260, 3648470, 4378164, 5472705, 7296940, 10945410, 21890820]

約数ペア:

[(1, 21890820), (2, 10945410), (3, 7296940), (4, 5472705), (5, 4378164), (6, 3648470), (7, 3127260), (10, 2189082), (12, 1824235), (14, 1563630), (15, 1459388), (20, 1094541), (21, 1042420), (28, 781815), (30, 729694), (35, 625452), (42, 521210), (60, 364847), (70, 312726), (84, 260605), (105, 208484), (140, 156363), (210, 104242), (420, 52121)]