20920575

素因数分解:

$3^1\times 5^2\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{499}}^1$

素因数の和:568

約数の個数: 48

約数和(自身を含む): 38192000

約数和(自身を除く): 17271425

約数列:

[1, 3, 5, 13, 15, 25, 39, 43, 65, 75, 129, 195, 215, 325, 499, 559, 645, 975, 1075, 1497, 1677, 2495, 2795, 3225, 6487, 7485, 8385, 12475, 13975, 19461, 21457, 32435, 37425, 41925, 64371, 97305, 107285, 162175, 278941, 321855, 486525, 536425, 836823, 1394705, 1609275, 4184115, 6973525, 20920575]

約数ペア:

[(1, 20920575), (3, 6973525), (5, 4184115), (13, 1609275), (15, 1394705), (25, 836823), (39, 536425), (43, 486525), (65, 321855), (75, 278941), (129, 162175), (195, 107285), (215, 97305), (325, 64371), (499, 41925), (559, 37425), (645, 32435), (975, 21457), (1075, 19461), (1497, 13975), (1677, 12475), (2495, 8385), (2795, 7485), (3225, 6487)]