19987120

素因数分解:

$2^4\times 5^1\times {\mathrm{229}}^1\times {\mathrm{1091}}^1$

素因数の和:1333

約数の個数: 40

約数和(自身を含む): 46715760

約数和(自身を除く): 26728640

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 229, 458, 916, 1091, 1145, 1832, 2182, 2290, 3664, 4364, 4580, 5455, 8728, 9160, 10910, 17456, 18320, 21820, 43640, 87280, 249839, 499678, 999356, 1249195, 1998712, 2498390, 3997424, 4996780, 9993560, 19987120]

約数ペア:

[(1, 19987120), (2, 9993560), (4, 4996780), (5, 3997424), (8, 2498390), (10, 1998712), (16, 1249195), (20, 999356), (40, 499678), (80, 249839), (229, 87280), (458, 43640), (916, 21820), (1091, 18320), (1145, 17456), (1832, 10910), (2182, 9160), (2290, 8728), (3664, 5455), (4364, 4580)]