21221980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{2633}}^1$

素因数の和:2686

約数の個数: 48

約数和(自身を含む): 49561344

約数和(自身を除く): 28339364

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 31, 52, 62, 65, 124, 130, 155, 260, 310, 403, 620, 806, 1612, 2015, 2633, 4030, 5266, 8060, 10532, 13165, 26330, 34229, 52660, 68458, 81623, 136916, 163246, 171145, 326492, 342290, 408115, 684580, 816230, 1061099, 1632460, 2122198, 4244396, 5305495, 10610990, 21221980]

約数ペア:

[(1, 21221980), (2, 10610990), (4, 5305495), (5, 4244396), (10, 2122198), (13, 1632460), (20, 1061099), (26, 816230), (31, 684580), (52, 408115), (62, 342290), (65, 326492), (124, 171145), (130, 163246), (155, 136916), (260, 81623), (310, 68458), (403, 52660), (620, 34229), (806, 26330), (1612, 13165), (2015, 10532), (2633, 8060), (4030, 5266)]