21549220

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{1999}}^1$

素因数の和:2033

約数の個数: 72

約数和(自身を含む): 57456000

約数和(自身を除く): 35906780

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 49, 55, 70, 77, 98, 110, 140, 154, 196, 220, 245, 308, 385, 490, 539, 770, 980, 1078, 1540, 1999, 2156, 2695, 3998, 5390, 7996, 9995, 10780, 13993, 19990, 21989, 27986, 39980, 43978, 55972, 69965, 87956, 97951, 109945, 139930, 153923, 195902, 219890, 279860, 307846, 391804, 439780, 489755, 615692, 769615, 979510, 1077461, 1539230, 1959020, 2154922, 3078460, 4309844, 5387305, 10774610, 21549220]

約数ペア:

[(1, 21549220), (2, 10774610), (4, 5387305), (5, 4309844), (7, 3078460), (10, 2154922), (11, 1959020), (14, 1539230), (20, 1077461), (22, 979510), (28, 769615), (35, 615692), (44, 489755), (49, 439780), (55, 391804), (70, 307846), (77, 279860), (98, 219890), (110, 195902), (140, 153923), (154, 139930), (196, 109945), (220, 97951), (245, 87956), (308, 69965), (385, 55972), (490, 43978), (539, 39980), (770, 27986), (980, 21989), (1078, 19990), (1540, 13993), (1999, 10780), (2156, 9995), (2695, 7996), (3998, 5390)]