21445775

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{151}}^1$

素因数の和:216

約数の個数: 48

約数和(自身を含む): 31664640

約数和(自身を除く): 10218865

約数列:

[1, 5, 13, 19, 23, 25, 65, 95, 115, 151, 247, 299, 325, 437, 475, 575, 755, 1235, 1495, 1963, 2185, 2869, 3473, 3775, 5681, 6175, 7475, 9815, 10925, 14345, 17365, 28405, 37297, 45149, 49075, 65987, 71725, 86825, 142025, 186485, 225745, 329935, 857831, 932425, 1128725, 1649675, 4289155, 21445775]

約数ペア:

[(1, 21445775), (5, 4289155), (13, 1649675), (19, 1128725), (23, 932425), (25, 857831), (65, 329935), (95, 225745), (115, 186485), (151, 142025), (247, 86825), (299, 71725), (325, 65987), (437, 49075), (475, 45149), (575, 37297), (755, 28405), (1235, 17365), (1495, 14345), (1963, 10925), (2185, 9815), (2869, 7475), (3473, 6175), (3775, 5681)]