21980618

素因数分解:

$2^1\times {\mathrm{11}}^2\times {\mathrm{61}}^1\times {\mathrm{1489}}^1$

素因数の和:1574

約数の個数: 24

約数和(自身を含む): 36859620

約数和(自身を除く): 14879002

約数列:

[1, 2, 11, 22, 61, 121, 122, 242, 671, 1342, 1489, 2978, 7381, 14762, 16379, 32758, 90829, 180169, 181658, 360338, 999119, 1998238, 10990309, 21980618]

約数ペア:

[(1, 21980618), (2, 10990309), (11, 1998238), (22, 999119), (61, 360338), (121, 181658), (122, 180169), (242, 90829), (671, 32758), (1342, 16379), (1489, 14762), (2978, 7381)]