21421000

素因数分解:

$2^3\times 5^3\times {\mathrm{31}}^1\times {\mathrm{691}}^1$

素因数の和:743

約数の個数: 64

約数和(自身を含む): 51816960

約数和(自身を除く): 30395960

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 31, 40, 50, 62, 100, 124, 125, 155, 200, 248, 250, 310, 500, 620, 691, 775, 1000, 1240, 1382, 1550, 2764, 3100, 3455, 3875, 5528, 6200, 6910, 7750, 13820, 15500, 17275, 21421, 27640, 31000, 34550, 42842, 69100, 85684, 86375, 107105, 138200, 171368, 172750, 214210, 345500, 428420, 535525, 691000, 856840, 1071050, 2142100, 2677625, 4284200, 5355250, 10710500, 21421000]

約数ペア:

[(1, 21421000), (2, 10710500), (4, 5355250), (5, 4284200), (8, 2677625), (10, 2142100), (20, 1071050), (25, 856840), (31, 691000), (40, 535525), (50, 428420), (62, 345500), (100, 214210), (124, 172750), (125, 171368), (155, 138200), (200, 107105), (248, 86375), (250, 85684), (310, 69100), (500, 42842), (620, 34550), (691, 31000), (775, 27640), (1000, 21421), (1240, 17275), (1382, 15500), (1550, 13820), (2764, 7750), (3100, 6910), (3455, 6200), (3875, 5528)]