19870720

素因数分解:

$2^{10}\times 5^1\times {\mathrm{3881}}^1$

素因数の和:3906

約数の個数: 44

約数和(自身を含む): 47678724

約数和(自身を除く): 27808004

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1024, 1280, 2560, 3881, 5120, 7762, 15524, 19405, 31048, 38810, 62096, 77620, 124192, 155240, 248384, 310480, 496768, 620960, 993536, 1241920, 1987072, 2483840, 3974144, 4967680, 9935360, 19870720]

約数ペア:

[(1, 19870720), (2, 9935360), (4, 4967680), (5, 3974144), (8, 2483840), (10, 1987072), (16, 1241920), (20, 993536), (32, 620960), (40, 496768), (64, 310480), (80, 248384), (128, 155240), (160, 124192), (256, 77620), (320, 62096), (512, 38810), (640, 31048), (1024, 19405), (1280, 15524), (2560, 7762), (3881, 5120)]