21219940

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{59}}^1\times {\mathrm{367}}^1$

素因数の和:449

約数の個数: 72

約数和(自身を含む): 52859520

約数和(自身を除く): 31639580

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 59, 70, 98, 118, 140, 196, 236, 245, 295, 367, 413, 490, 590, 734, 826, 980, 1180, 1468, 1652, 1835, 2065, 2569, 2891, 3670, 4130, 5138, 5782, 7340, 8260, 10276, 11564, 12845, 14455, 17983, 21653, 25690, 28910, 35966, 43306, 51380, 57820, 71932, 86612, 89915, 108265, 151571, 179830, 216530, 303142, 359660, 433060, 606284, 757855, 1060997, 1515710, 2121994, 3031420, 4243988, 5304985, 10609970, 21219940]

約数ペア:

[(1, 21219940), (2, 10609970), (4, 5304985), (5, 4243988), (7, 3031420), (10, 2121994), (14, 1515710), (20, 1060997), (28, 757855), (35, 606284), (49, 433060), (59, 359660), (70, 303142), (98, 216530), (118, 179830), (140, 151571), (196, 108265), (236, 89915), (245, 86612), (295, 71932), (367, 57820), (413, 51380), (490, 43306), (590, 35966), (734, 28910), (826, 25690), (980, 21653), (1180, 17983), (1468, 14455), (1652, 12845), (1835, 11564), (2065, 10276), (2569, 8260), (2891, 7340), (3670, 5782), (4130, 5138)]