21811920

素因数分解:

$2^4\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{6991}}^1$

素因数の和:7020

約数の個数: 80

約数和(自身を含む): 72828672

約数和(自身を除く): 51016752

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 16, 20, 24, 26, 30, 39, 40, 48, 52, 60, 65, 78, 80, 104, 120, 130, 156, 195, 208, 240, 260, 312, 390, 520, 624, 780, 1040, 1560, 3120, 6991, 13982, 20973, 27964, 34955, 41946, 55928, 69910, 83892, 90883, 104865, 111856, 139820, 167784, 181766, 209730, 272649, 279640, 335568, 363532, 419460, 454415, 545298, 559280, 727064, 838920, 908830, 1090596, 1363245, 1454128, 1677840, 1817660, 2181192, 2726490, 3635320, 4362384, 5452980, 7270640, 10905960, 21811920]

約数ペア:

[(1, 21811920), (2, 10905960), (3, 7270640), (4, 5452980), (5, 4362384), (6, 3635320), (8, 2726490), (10, 2181192), (12, 1817660), (13, 1677840), (15, 1454128), (16, 1363245), (20, 1090596), (24, 908830), (26, 838920), (30, 727064), (39, 559280), (40, 545298), (48, 454415), (52, 419460), (60, 363532), (65, 335568), (78, 279640), (80, 272649), (104, 209730), (120, 181766), (130, 167784), (156, 139820), (195, 111856), (208, 104865), (240, 90883), (260, 83892), (312, 69910), (390, 55928), (520, 41946), (624, 34955), (780, 27964), (1040, 20973), (1560, 13982), (3120, 6991)]