21328440

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{25391}}^1$

素因数の和:25412

約数の個数: 64

約数和(自身を含む): 73128960

約数和(自身を除く): 51800520

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840, 25391, 50782, 76173, 101564, 126955, 152346, 177737, 203128, 253910, 304692, 355474, 380865, 507820, 533211, 609384, 710948, 761730, 888685, 1015640, 1066422, 1421896, 1523460, 1777370, 2132844, 2666055, 3046920, 3554740, 4265688, 5332110, 7109480, 10664220, 21328440]

約数ペア:

[(1, 21328440), (2, 10664220), (3, 7109480), (4, 5332110), (5, 4265688), (6, 3554740), (7, 3046920), (8, 2666055), (10, 2132844), (12, 1777370), (14, 1523460), (15, 1421896), (20, 1066422), (21, 1015640), (24, 888685), (28, 761730), (30, 710948), (35, 609384), (40, 533211), (42, 507820), (56, 380865), (60, 355474), (70, 304692), (84, 253910), (105, 203128), (120, 177737), (140, 152346), (168, 126955), (210, 101564), (280, 76173), (420, 50782), (840, 25391)]