20281456

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{281}}^1\times {\mathrm{347}}^1$

素因数の和:649

約数の個数: 40

約数和(自身を含む): 42591024

約数和(自身を除く): 22309568

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 281, 347, 562, 694, 1124, 1388, 2248, 2776, 3653, 4496, 4511, 5552, 7306, 9022, 14612, 18044, 29224, 36088, 58448, 72176, 97507, 195014, 390028, 780056, 1267591, 1560112, 2535182, 5070364, 10140728, 20281456]

約数ペア:

[(1, 20281456), (2, 10140728), (4, 5070364), (8, 2535182), (13, 1560112), (16, 1267591), (26, 780056), (52, 390028), (104, 195014), (208, 97507), (281, 72176), (347, 58448), (562, 36088), (694, 29224), (1124, 18044), (1388, 14612), (2248, 9022), (2776, 7306), (3653, 5552), (4496, 4511)]