20639216

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{67}}^1\times {\mathrm{1481}}^1$

素因数の和:1569

約数の個数: 40

約数和(自身を含む): 43736784

約数和(自身を除く): 23097568

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 67, 104, 134, 208, 268, 536, 871, 1072, 1481, 1742, 2962, 3484, 5924, 6968, 11848, 13936, 19253, 23696, 38506, 77012, 99227, 154024, 198454, 308048, 396908, 793816, 1289951, 1587632, 2579902, 5159804, 10319608, 20639216]

約数ペア:

[(1, 20639216), (2, 10319608), (4, 5159804), (8, 2579902), (13, 1587632), (16, 1289951), (26, 793816), (52, 396908), (67, 308048), (104, 198454), (134, 154024), (208, 99227), (268, 77012), (536, 38506), (871, 23696), (1072, 19253), (1481, 13936), (1742, 11848), (2962, 6968), (3484, 5924)]