21291725

素因数分解:

$5^2\times 7^3\times {\mathrm{13}}^1\times {\mathrm{191}}^1$

素因数の和:235

約数の個数: 48

約数和(自身を含む): 33331200

約数和(自身を除く): 12039475

約数列:

[1, 5, 7, 13, 25, 35, 49, 65, 91, 175, 191, 245, 325, 343, 455, 637, 955, 1225, 1337, 1715, 2275, 2483, 3185, 4459, 4775, 6685, 8575, 9359, 12415, 15925, 17381, 22295, 33425, 46795, 62075, 65513, 86905, 111475, 121667, 233975, 327565, 434525, 608335, 851669, 1637825, 3041675, 4258345, 21291725]

約数ペア:

[(1, 21291725), (5, 4258345), (7, 3041675), (13, 1637825), (25, 851669), (35, 608335), (49, 434525), (65, 327565), (91, 233975), (175, 121667), (191, 111475), (245, 86905), (325, 65513), (343, 62075), (455, 46795), (637, 33425), (955, 22295), (1225, 17381), (1337, 15925), (1715, 12415), (2275, 9359), (2483, 8575), (3185, 6685), (4459, 4775)]