20650880

素因数分解:

$2^7\times 5^1\times {\mathrm{41}}^1\times {\mathrm{787}}^1$

素因数の和:847

約数の個数: 64

約数和(自身を含む): 50636880

約数和(自身を除く): 29986000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 41, 64, 80, 82, 128, 160, 164, 205, 320, 328, 410, 640, 656, 787, 820, 1312, 1574, 1640, 2624, 3148, 3280, 3935, 5248, 6296, 6560, 7870, 12592, 13120, 15740, 25184, 26240, 31480, 32267, 50368, 62960, 64534, 100736, 125920, 129068, 161335, 251840, 258136, 322670, 503680, 516272, 645340, 1032544, 1290680, 2065088, 2581360, 4130176, 5162720, 10325440, 20650880]

約数ペア:

[(1, 20650880), (2, 10325440), (4, 5162720), (5, 4130176), (8, 2581360), (10, 2065088), (16, 1290680), (20, 1032544), (32, 645340), (40, 516272), (41, 503680), (64, 322670), (80, 258136), (82, 251840), (128, 161335), (160, 129068), (164, 125920), (205, 100736), (320, 64534), (328, 62960), (410, 50368), (640, 32267), (656, 31480), (787, 26240), (820, 25184), (1312, 15740), (1574, 13120), (1640, 12592), (2624, 7870), (3148, 6560), (3280, 6296), (3935, 5248)]