21800980

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{103}}^1\times {\mathrm{557}}^1$

素因数の和:688

約数の個数: 48

約数和(自身を含む): 48746880

約数和(自身を除く): 26945900

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 103, 190, 206, 380, 412, 515, 557, 1030, 1114, 1957, 2060, 2228, 2785, 3914, 5570, 7828, 9785, 10583, 11140, 19570, 21166, 39140, 42332, 52915, 57371, 105830, 114742, 211660, 229484, 286855, 573710, 1090049, 1147420, 2180098, 4360196, 5450245, 10900490, 21800980]

約数ペア:

[(1, 21800980), (2, 10900490), (4, 5450245), (5, 4360196), (10, 2180098), (19, 1147420), (20, 1090049), (38, 573710), (76, 286855), (95, 229484), (103, 211660), (190, 114742), (206, 105830), (380, 57371), (412, 52915), (515, 42332), (557, 39140), (1030, 21166), (1114, 19570), (1957, 11140), (2060, 10583), (2228, 9785), (2785, 7828), (3914, 5570)]