638521720

素因数分解:

$2^3\times 5^1\times {\mathrm{103}}^1\times {\mathrm{154981}}^1$

素因数の和:155095

約数の個数: 32

約数和(自身を含む): 1450631520

約数和(自身を除く): 812109800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 103, 206, 412, 515, 824, 1030, 2060, 4120, 154981, 309962, 619924, 774905, 1239848, 1549810, 3099620, 6199240, 15963043, 31926086, 63852172, 79815215, 127704344, 159630430, 319260860, 638521720]

約数ペア:

[(1, 638521720), (2, 319260860), (4, 159630430), (5, 127704344), (8, 79815215), (10, 63852172), (20, 31926086), (40, 15963043), (103, 6199240), (206, 3099620), (412, 1549810), (515, 1239848), (824, 774905), (1030, 619924), (2060, 309962), (4120, 154981)]