20837840

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{6353}}^1$

素因数の和:6407

約数の個数: 40

約数和(自身を含む): 49637448

約数和(自身を除く): 28799608

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 6353, 12706, 25412, 31765, 50824, 63530, 101648, 127060, 254120, 260473, 508240, 520946, 1041892, 1302365, 2083784, 2604730, 4167568, 5209460, 10418920, 20837840]

約数ペア:

[(1, 20837840), (2, 10418920), (4, 5209460), (5, 4167568), (8, 2604730), (10, 2083784), (16, 1302365), (20, 1041892), (40, 520946), (41, 508240), (80, 260473), (82, 254120), (164, 127060), (205, 101648), (328, 63530), (410, 50824), (656, 31765), (820, 25412), (1640, 12706), (3280, 6353)]