21289240

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{139}}^1\times {\mathrm{547}}^1$

素因数の和:704

約数の個数: 64

約数和(自身を含む): 55238400

約数和(自身を除く): 33949160

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 139, 140, 278, 280, 547, 556, 695, 973, 1094, 1112, 1390, 1946, 2188, 2735, 2780, 3829, 3892, 4376, 4865, 5470, 5560, 7658, 7784, 9730, 10940, 15316, 19145, 19460, 21880, 30632, 38290, 38920, 76033, 76580, 152066, 153160, 304132, 380165, 532231, 608264, 760330, 1064462, 1520660, 2128924, 2661155, 3041320, 4257848, 5322310, 10644620, 21289240]

約数ペア:

[(1, 21289240), (2, 10644620), (4, 5322310), (5, 4257848), (7, 3041320), (8, 2661155), (10, 2128924), (14, 1520660), (20, 1064462), (28, 760330), (35, 608264), (40, 532231), (56, 380165), (70, 304132), (139, 153160), (140, 152066), (278, 76580), (280, 76033), (547, 38920), (556, 38290), (695, 30632), (973, 21880), (1094, 19460), (1112, 19145), (1390, 15316), (1946, 10940), (2188, 9730), (2735, 7784), (2780, 7658), (3829, 5560), (3892, 5470), (4376, 4865)]