20643975

素因数分解:

$3^2\times 5^2\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{439}}^1$

素因数の和:485

約数の個数: 72

約数和(自身を含む): 42556800

約数和(自身を除く): 21912825

約数列:

[1, 3, 5, 9, 11, 15, 19, 25, 33, 45, 55, 57, 75, 95, 99, 165, 171, 209, 225, 275, 285, 439, 475, 495, 627, 825, 855, 1045, 1317, 1425, 1881, 2195, 2475, 3135, 3951, 4275, 4829, 5225, 6585, 8341, 9405, 10975, 14487, 15675, 19755, 24145, 25023, 32925, 41705, 43461, 47025, 72435, 75069, 91751, 98775, 120725, 125115, 208525, 217305, 275253, 362175, 375345, 458755, 625575, 825759, 1086525, 1376265, 1876725, 2293775, 4128795, 6881325, 20643975]

約数ペア:

[(1, 20643975), (3, 6881325), (5, 4128795), (9, 2293775), (11, 1876725), (15, 1376265), (19, 1086525), (25, 825759), (33, 625575), (45, 458755), (55, 375345), (57, 362175), (75, 275253), (95, 217305), (99, 208525), (165, 125115), (171, 120725), (209, 98775), (225, 91751), (275, 75069), (285, 72435), (439, 47025), (475, 43461), (495, 41705), (627, 32925), (825, 25023), (855, 24145), (1045, 19755), (1317, 15675), (1425, 14487), (1881, 10975), (2195, 9405), (2475, 8341), (3135, 6585), (3951, 5225), (4275, 4829)]