21085580

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{71}}^1\times {\mathrm{479}}^1$

素因数の和:590

約数の個数: 48

約数和(自身を含む): 46448640

約数和(自身を除く): 25363060

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 71, 124, 142, 155, 284, 310, 355, 479, 620, 710, 958, 1420, 1916, 2201, 2395, 4402, 4790, 8804, 9580, 11005, 14849, 22010, 29698, 34009, 44020, 59396, 68018, 74245, 136036, 148490, 170045, 296980, 340090, 680180, 1054279, 2108558, 4217116, 5271395, 10542790, 21085580]

約数ペア:

[(1, 21085580), (2, 10542790), (4, 5271395), (5, 4217116), (10, 2108558), (20, 1054279), (31, 680180), (62, 340090), (71, 296980), (124, 170045), (142, 148490), (155, 136036), (284, 74245), (310, 68018), (355, 59396), (479, 44020), (620, 34009), (710, 29698), (958, 22010), (1420, 14849), (1916, 11005), (2201, 9580), (2395, 8804), (4402, 4790)]