21156728

素因数分解:

$2^3\times {\mathrm{19}}^1\times {\mathrm{181}}^1\times {\mathrm{769}}^1$

素因数の和:975

約数の個数: 32

約数和(自身を含む): 42042000

約数和(自身を除く): 20885272

約数列:

[1, 2, 4, 8, 19, 38, 76, 152, 181, 362, 724, 769, 1448, 1538, 3076, 3439, 6152, 6878, 13756, 14611, 27512, 29222, 58444, 116888, 139189, 278378, 556756, 1113512, 2644591, 5289182, 10578364, 21156728]

約数ペア:

[(1, 21156728), (2, 10578364), (4, 5289182), (8, 2644591), (19, 1113512), (38, 556756), (76, 278378), (152, 139189), (181, 116888), (362, 58444), (724, 29222), (769, 27512), (1448, 14611), (1538, 13756), (3076, 6878), (3439, 6152)]