21528220

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{367}}^1\times {\mathrm{419}}^1$

素因数の和:802

約数の個数: 48

約数和(自身を含む): 51932160

約数和(自身を除く): 30403940

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 367, 419, 734, 838, 1468, 1676, 1835, 2095, 2569, 2933, 3670, 4190, 5138, 5866, 7340, 8380, 10276, 11732, 12845, 14665, 25690, 29330, 51380, 58660, 153773, 307546, 615092, 768865, 1076411, 1537730, 2152822, 3075460, 4305644, 5382055, 10764110, 21528220]

約数ペア:

[(1, 21528220), (2, 10764110), (4, 5382055), (5, 4305644), (7, 3075460), (10, 2152822), (14, 1537730), (20, 1076411), (28, 768865), (35, 615092), (70, 307546), (140, 153773), (367, 58660), (419, 51380), (734, 29330), (838, 25690), (1468, 14665), (1676, 12845), (1835, 11732), (2095, 10276), (2569, 8380), (2933, 7340), (3670, 5866), (4190, 5138)]