19781120

素因数分解:

$2^9\times 5^1\times {\mathrm{7727}}^1$

素因数の和:7750

約数の個数: 40

約数和(自身を含む): 47434464

約数和(自身を除く): 27653344

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1280, 2560, 7727, 15454, 30908, 38635, 61816, 77270, 123632, 154540, 247264, 309080, 494528, 618160, 989056, 1236320, 1978112, 2472640, 3956224, 4945280, 9890560, 19781120]

約数ペア:

[(1, 19781120), (2, 9890560), (4, 4945280), (5, 3956224), (8, 2472640), (10, 1978112), (16, 1236320), (20, 989056), (32, 618160), (40, 494528), (64, 309080), (80, 247264), (128, 154540), (160, 123632), (256, 77270), (320, 61816), (512, 38635), (640, 30908), (1280, 15454), (2560, 7727)]