20189975

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{73}}^1$

素因数の和:156

約数の個数: 48

約数和(自身を含む): 29289792

約数和(自身を除く): 9099817

約数列:

[1, 5, 13, 23, 25, 37, 65, 73, 115, 185, 299, 325, 365, 481, 575, 851, 925, 949, 1495, 1679, 1825, 2405, 2701, 4255, 4745, 7475, 8395, 11063, 12025, 13505, 21275, 21827, 23725, 35113, 41975, 55315, 62123, 67525, 109135, 175565, 276575, 310615, 545675, 807599, 877825, 1553075, 4037995, 20189975]

約数ペア:

[(1, 20189975), (5, 4037995), (13, 1553075), (23, 877825), (25, 807599), (37, 545675), (65, 310615), (73, 276575), (115, 175565), (185, 109135), (299, 67525), (325, 62123), (365, 55315), (481, 41975), (575, 35113), (851, 23725), (925, 21827), (949, 21275), (1495, 13505), (1679, 12025), (1825, 11063), (2405, 8395), (2701, 7475), (4255, 4745)]