644840

素因数分解:

$2^3\times 5^1\times 7^3\times {\mathrm{47}}^1$

素因数の和:79

約数の個数: 64

約数和(自身を含む): 1728000

約数和(自身を除く): 1083160

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 47, 49, 56, 70, 94, 98, 140, 188, 196, 235, 245, 280, 329, 343, 376, 392, 470, 490, 658, 686, 940, 980, 1316, 1372, 1645, 1715, 1880, 1960, 2303, 2632, 2744, 3290, 3430, 4606, 6580, 6860, 9212, 11515, 13160, 13720, 16121, 18424, 23030, 32242, 46060, 64484, 80605, 92120, 128968, 161210, 322420, 644840]

約数ペア:

[(1, 644840), (2, 322420), (4, 161210), (5, 128968), (7, 92120), (8, 80605), (10, 64484), (14, 46060), (20, 32242), (28, 23030), (35, 18424), (40, 16121), (47, 13720), (49, 13160), (56, 11515), (70, 9212), (94, 6860), (98, 6580), (140, 4606), (188, 3430), (196, 3290), (235, 2744), (245, 2632), (280, 2303), (329, 1960), (343, 1880), (376, 1715), (392, 1645), (470, 1372), (490, 1316), (658, 980), (686, 940)]