19978240

素因数分解:

$2^{11}\times 5^1\times {\mathrm{1951}}^1$

素因数の和:1978

約数の個数: 48

約数和(自身を含む): 47960640

約数和(自身を除く): 27982400

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1024, 1280, 1951, 2048, 2560, 3902, 5120, 7804, 9755, 10240, 15608, 19510, 31216, 39020, 62432, 78040, 124864, 156080, 249728, 312160, 499456, 624320, 998912, 1248640, 1997824, 2497280, 3995648, 4994560, 9989120, 19978240]

約数ペア:

[(1, 19978240), (2, 9989120), (4, 4994560), (5, 3995648), (8, 2497280), (10, 1997824), (16, 1248640), (20, 998912), (32, 624320), (40, 499456), (64, 312160), (80, 249728), (128, 156080), (160, 124864), (256, 78040), (320, 62432), (512, 39020), (640, 31216), (1024, 19510), (1280, 15608), (1951, 10240), (2048, 9755), (2560, 7804), (3902, 5120)]