21141380

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{61}}^1$

素因数の和:157

約数の個数: 96

約数和(自身を含む): 51330048

約数和(自身を除く): 30188668

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 31, 43, 52, 61, 62, 65, 86, 122, 124, 130, 155, 172, 215, 244, 260, 305, 310, 403, 430, 559, 610, 620, 793, 806, 860, 1118, 1220, 1333, 1586, 1612, 1891, 2015, 2236, 2623, 2666, 2795, 3172, 3782, 3965, 4030, 5246, 5332, 5590, 6665, 7564, 7930, 8060, 9455, 10492, 11180, 13115, 13330, 15860, 17329, 18910, 24583, 26230, 26660, 34099, 34658, 37820, 49166, 52460, 68198, 69316, 81313, 86645, 98332, 122915, 136396, 162626, 170495, 173290, 245830, 325252, 340990, 346580, 406565, 491660, 681980, 813130, 1057069, 1626260, 2114138, 4228276, 5285345, 10570690, 21141380]

約数ペア:

[(1, 21141380), (2, 10570690), (4, 5285345), (5, 4228276), (10, 2114138), (13, 1626260), (20, 1057069), (26, 813130), (31, 681980), (43, 491660), (52, 406565), (61, 346580), (62, 340990), (65, 325252), (86, 245830), (122, 173290), (124, 170495), (130, 162626), (155, 136396), (172, 122915), (215, 98332), (244, 86645), (260, 81313), (305, 69316), (310, 68198), (403, 52460), (430, 49166), (559, 37820), (610, 34658), (620, 34099), (793, 26660), (806, 26230), (860, 24583), (1118, 18910), (1220, 17329), (1333, 15860), (1586, 13330), (1612, 13115), (1891, 11180), (2015, 10492), (2236, 9455), (2623, 8060), (2666, 7930), (2795, 7564), (3172, 6665), (3782, 5590), (3965, 5332), (4030, 5246)]