21005790

素因数分解:

$2^1\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{53861}}^1$

素因数の和:53884

約数の個数: 32

約数和(自身を含む): 54292896

約数和(自身を除く): 33287106

約数列:

[1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 195, 390, 53861, 107722, 161583, 269305, 323166, 538610, 700193, 807915, 1400386, 1615830, 2100579, 3500965, 4201158, 7001930, 10502895, 21005790]

約数ペア:

[(1, 21005790), (2, 10502895), (3, 7001930), (5, 4201158), (6, 3500965), (10, 2100579), (13, 1615830), (15, 1400386), (26, 807915), (30, 700193), (39, 538610), (65, 323166), (78, 269305), (130, 161583), (195, 107722), (390, 53861)]