21820280

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{17597}}^1$

素因数の和:17639

約数の個数: 32

約数和(自身を含む): 50682240

約数和(自身を除く): 28861960

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 17597, 35194, 70388, 87985, 140776, 175970, 351940, 545507, 703880, 1091014, 2182028, 2727535, 4364056, 5455070, 10910140, 21820280]

約数ペア:

[(1, 21820280), (2, 10910140), (4, 5455070), (5, 4364056), (8, 2727535), (10, 2182028), (20, 1091014), (31, 703880), (40, 545507), (62, 351940), (124, 175970), (155, 140776), (248, 87985), (310, 70388), (620, 35194), (1240, 17597)]