639940

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{653}}^1$

素因数の和:676

約数の個数: 36

約数和(自身を含む): 1565676

約数和(自身を除く): 925736

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490, 653, 980, 1306, 2612, 3265, 4571, 6530, 9142, 13060, 18284, 22855, 31997, 45710, 63994, 91420, 127988, 159985, 319970, 639940]

約数ペア:

[(1, 639940), (2, 319970), (4, 159985), (5, 127988), (7, 91420), (10, 63994), (14, 45710), (20, 31997), (28, 22855), (35, 18284), (49, 13060), (70, 9142), (98, 6530), (140, 4571), (196, 3265), (245, 2612), (490, 1306), (653, 980)]