21392020

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{6329}}^1$

素因数の和:6364

約数の個数: 36

約数和(自身を含む): 48652380

約数和(自身を除く): 27260360

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 169, 260, 338, 676, 845, 1690, 3380, 6329, 12658, 25316, 31645, 63290, 82277, 126580, 164554, 329108, 411385, 822770, 1069601, 1645540, 2139202, 4278404, 5348005, 10696010, 21392020]

約数ペア:

[(1, 21392020), (2, 10696010), (4, 5348005), (5, 4278404), (10, 2139202), (13, 1645540), (20, 1069601), (26, 822770), (52, 411385), (65, 329108), (130, 164554), (169, 126580), (260, 82277), (338, 63290), (676, 31645), (845, 25316), (1690, 12658), (3380, 6329)]