21981800

素因数分解:

$2^3\times 5^2\times {\mathrm{131}}^1\times {\mathrm{839}}^1$

素因数の和:986

約数の個数: 48

約数和(自身を含む): 51559200

約数和(自身を除く): 29577400

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 131, 200, 262, 524, 655, 839, 1048, 1310, 1678, 2620, 3275, 3356, 4195, 5240, 6550, 6712, 8390, 13100, 16780, 20975, 26200, 33560, 41950, 83900, 109909, 167800, 219818, 439636, 549545, 879272, 1099090, 2198180, 2747725, 4396360, 5495450, 10990900, 21981800]

約数ペア:

[(1, 21981800), (2, 10990900), (4, 5495450), (5, 4396360), (8, 2747725), (10, 2198180), (20, 1099090), (25, 879272), (40, 549545), (50, 439636), (100, 219818), (131, 167800), (200, 109909), (262, 83900), (524, 41950), (655, 33560), (839, 26200), (1048, 20975), (1310, 16780), (1678, 13100), (2620, 8390), (3275, 6712), (3356, 6550), (4195, 5240)]