21905940

素因数分解:

$2^2\times 3^1\times 5^1\times 7^2\times {\mathrm{7451}}^1$

素因数の和:7477

約数の個数: 72

約数和(自身を含む): 71360352

約数和(自身を除く): 49454412

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 49, 60, 70, 84, 98, 105, 140, 147, 196, 210, 245, 294, 420, 490, 588, 735, 980, 1470, 2940, 7451, 14902, 22353, 29804, 37255, 44706, 52157, 74510, 89412, 104314, 111765, 149020, 156471, 208628, 223530, 260785, 312942, 365099, 447060, 521570, 625884, 730198, 782355, 1043140, 1095297, 1460396, 1564710, 1825495, 2190594, 3129420, 3650990, 4381188, 5476485, 7301980, 10952970, 21905940]

約数ペア:

[(1, 21905940), (2, 10952970), (3, 7301980), (4, 5476485), (5, 4381188), (6, 3650990), (7, 3129420), (10, 2190594), (12, 1825495), (14, 1564710), (15, 1460396), (20, 1095297), (21, 1043140), (28, 782355), (30, 730198), (35, 625884), (42, 521570), (49, 447060), (60, 365099), (70, 312942), (84, 260785), (98, 223530), (105, 208628), (140, 156471), (147, 149020), (196, 111765), (210, 104314), (245, 89412), (294, 74510), (420, 52157), (490, 44706), (588, 37255), (735, 29804), (980, 22353), (1470, 14902), (2940, 7451)]