20721025

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{103}}^1\times {\mathrm{619}}^1$

素因数の和:745

約数の個数: 24

約数和(自身を含む): 27984320

約数和(自身を除く): 7263295

約数列:

[1, 5, 13, 25, 65, 103, 325, 515, 619, 1339, 2575, 3095, 6695, 8047, 15475, 33475, 40235, 63757, 201175, 318785, 828841, 1593925, 4144205, 20721025]

約数ペア:

[(1, 20721025), (5, 4144205), (13, 1593925), (25, 828841), (65, 318785), (103, 201175), (325, 63757), (515, 40235), (619, 33475), (1339, 15475), (2575, 8047), (3095, 6695)]