20728175

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{59}}^1$

素因数の和:152

約数の個数: 48

約数和(自身を含む): 29998080

約数和(自身を除く): 9269905

約数列:

[1, 5, 13, 23, 25, 47, 59, 65, 115, 235, 295, 299, 325, 575, 611, 767, 1081, 1175, 1357, 1475, 1495, 2773, 3055, 3835, 5405, 6785, 7475, 13865, 14053, 15275, 17641, 19175, 27025, 33925, 36049, 63779, 69325, 70265, 88205, 180245, 318895, 351325, 441025, 829127, 901225, 1594475, 4145635, 20728175]

約数ペア:

[(1, 20728175), (5, 4145635), (13, 1594475), (23, 901225), (25, 829127), (47, 441025), (59, 351325), (65, 318895), (115, 180245), (235, 88205), (295, 70265), (299, 69325), (325, 63779), (575, 36049), (611, 33925), (767, 27025), (1081, 19175), (1175, 17641), (1357, 15275), (1475, 14053), (1495, 13865), (2773, 7475), (3055, 6785), (3835, 5405)]