21071320

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{16993}}^1$

素因数の和:17035

約数の個数: 32

約数和(自身を含む): 48942720

約数和(自身を除く): 27871400

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 16993, 33986, 67972, 84965, 135944, 169930, 339860, 526783, 679720, 1053566, 2107132, 2633915, 4214264, 5267830, 10535660, 21071320]

約数ペア:

[(1, 21071320), (2, 10535660), (4, 5267830), (5, 4214264), (8, 2633915), (10, 2107132), (20, 1053566), (31, 679720), (40, 526783), (62, 339860), (124, 169930), (155, 135944), (248, 84965), (310, 67972), (620, 33986), (1240, 16993)]