20438840

素因数分解:

$2^3\times 5^1\times {\mathrm{523}}^1\times {\mathrm{977}}^1$

素因数の和:1511

約数の個数: 32

約数和(自身を含む): 46122480

約数和(自身を除く): 25683640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 523, 977, 1046, 1954, 2092, 2615, 3908, 4184, 4885, 5230, 7816, 9770, 10460, 19540, 20920, 39080, 510971, 1021942, 2043884, 2554855, 4087768, 5109710, 10219420, 20438840]

約数ペア:

[(1, 20438840), (2, 10219420), (4, 5109710), (5, 4087768), (8, 2554855), (10, 2043884), (20, 1021942), (40, 510971), (523, 39080), (977, 20920), (1046, 19540), (1954, 10460), (2092, 9770), (2615, 7816), (3908, 5230), (4184, 4885)]