20881456

素因数分解:

$2^4\times {\mathrm{19}}^1\times {\mathrm{149}}^1\times {\mathrm{461}}^1$

素因数の和:637

約数の個数: 40

約数和(自身を含む): 42966000

約数和(自身を除く): 22084544

約数列:

[1, 2, 4, 8, 16, 19, 38, 76, 149, 152, 298, 304, 461, 596, 922, 1192, 1844, 2384, 2831, 3688, 5662, 7376, 8759, 11324, 17518, 22648, 35036, 45296, 68689, 70072, 137378, 140144, 274756, 549512, 1099024, 1305091, 2610182, 5220364, 10440728, 20881456]

約数ペア:

[(1, 20881456), (2, 10440728), (4, 5220364), (8, 2610182), (16, 1305091), (19, 1099024), (38, 549512), (76, 274756), (149, 140144), (152, 137378), (298, 70072), (304, 68689), (461, 45296), (596, 35036), (922, 22648), (1192, 17518), (1844, 11324), (2384, 8759), (2831, 7376), (3688, 5662)]