20985390

素因数分解:

$2^1\times 3^2\times 5^1\times {\mathrm{431}}^1\times {\mathrm{541}}^1$

素因数の和:985

約数の個数: 48

約数和(自身を含む): 54789696

約数和(自身を除く): 33804306

約数列:

[1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90, 431, 541, 862, 1082, 1293, 1623, 2155, 2586, 2705, 3246, 3879, 4310, 4869, 5410, 6465, 7758, 8115, 9738, 12930, 16230, 19395, 24345, 38790, 48690, 233171, 466342, 699513, 1165855, 1399026, 2098539, 2331710, 3497565, 4197078, 6995130, 10492695, 20985390]

約数ペア:

[(1, 20985390), (2, 10492695), (3, 6995130), (5, 4197078), (6, 3497565), (9, 2331710), (10, 2098539), (15, 1399026), (18, 1165855), (30, 699513), (45, 466342), (90, 233171), (431, 48690), (541, 38790), (862, 24345), (1082, 19395), (1293, 16230), (1623, 12930), (2155, 9738), (2586, 8115), (2705, 7758), (3246, 6465), (3879, 5410), (4310, 4869)]