20787664

素因数分解:

$2^4\times {\mathrm{29}}^1\times {\mathrm{71}}^1\times {\mathrm{631}}^1$

素因数の和:739

約数の個数: 40

約数和(自身を含む): 42318720

約数和(自身を除く): 21531056

約数列:

[1, 2, 4, 8, 16, 29, 58, 71, 116, 142, 232, 284, 464, 568, 631, 1136, 1262, 2059, 2524, 4118, 5048, 8236, 10096, 16472, 18299, 32944, 36598, 44801, 73196, 89602, 146392, 179204, 292784, 358408, 716816, 1299229, 2598458, 5196916, 10393832, 20787664]

約数ペア:

[(1, 20787664), (2, 10393832), (4, 5196916), (8, 2598458), (16, 1299229), (29, 716816), (58, 358408), (71, 292784), (116, 179204), (142, 146392), (232, 89602), (284, 73196), (464, 44801), (568, 36598), (631, 32944), (1136, 18299), (1262, 16472), (2059, 10096), (2524, 8236), (4118, 5048)]