21741620

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{71}}^1\times {\mathrm{251}}^1$

素因数の和:392

約数の個数: 48

約数和(自身を含む): 47246976

約数和(自身を除く): 25505356

約数列:

[1, 2, 4, 5, 10, 20, 61, 71, 122, 142, 244, 251, 284, 305, 355, 502, 610, 710, 1004, 1220, 1255, 1420, 2510, 4331, 5020, 8662, 15311, 17324, 17821, 21655, 30622, 35642, 43310, 61244, 71284, 76555, 86620, 89105, 153110, 178210, 306220, 356420, 1087081, 2174162, 4348324, 5435405, 10870810, 21741620]

約数ペア:

[(1, 21741620), (2, 10870810), (4, 5435405), (5, 4348324), (10, 2174162), (20, 1087081), (61, 356420), (71, 306220), (122, 178210), (142, 153110), (244, 89105), (251, 86620), (284, 76555), (305, 71284), (355, 61244), (502, 43310), (610, 35642), (710, 30622), (1004, 21655), (1220, 17821), (1255, 17324), (1420, 15311), (2510, 8662), (4331, 5020)]