21989420

素因数分解:

$2^2\times 5^1\times {\mathrm{47}}^1\times {\mathrm{149}}^1\times {\mathrm{157}}^1$

素因数の和:362

約数の個数: 48

約数和(自身を含む): 47779200

約数和(自身を除く): 25789780

約数列:

[1, 2, 4, 5, 10, 20, 47, 94, 149, 157, 188, 235, 298, 314, 470, 596, 628, 745, 785, 940, 1490, 1570, 2980, 3140, 7003, 7379, 14006, 14758, 23393, 28012, 29516, 35015, 36895, 46786, 70030, 73790, 93572, 116965, 140060, 147580, 233930, 467860, 1099471, 2198942, 4397884, 5497355, 10994710, 21989420]

約数ペア:

[(1, 21989420), (2, 10994710), (4, 5497355), (5, 4397884), (10, 2198942), (20, 1099471), (47, 467860), (94, 233930), (149, 147580), (157, 140060), (188, 116965), (235, 93572), (298, 73790), (314, 70030), (470, 46786), (596, 36895), (628, 35015), (745, 29516), (785, 28012), (940, 23393), (1490, 14758), (1570, 14006), (2980, 7379), (3140, 7003)]