21060880

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{6421}}^1$

素因数の和:6475

約数の個数: 40

約数和(自身を含む): 50168664

約数和(自身を除く): 29107784

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 6421, 12842, 25684, 32105, 51368, 64210, 102736, 128420, 256840, 263261, 513680, 526522, 1053044, 1316305, 2106088, 2632610, 4212176, 5265220, 10530440, 21060880]

約数ペア:

[(1, 21060880), (2, 10530440), (4, 5265220), (5, 4212176), (8, 2632610), (10, 2106088), (16, 1316305), (20, 1053044), (40, 526522), (41, 513680), (80, 263261), (82, 256840), (164, 128420), (205, 102736), (328, 64210), (410, 51368), (656, 32105), (820, 25684), (1640, 12842), (3280, 6421)]