20921680

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20117}}^1$

素因数の和:20143

約数の個数: 40

約数和(自身を含む): 52387272

約数和(自身を除く): 31465592

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20117, 40234, 80468, 100585, 160936, 201170, 261521, 321872, 402340, 523042, 804680, 1046084, 1307605, 1609360, 2092168, 2615210, 4184336, 5230420, 10460840, 20921680]

約数ペア:

[(1, 20921680), (2, 10460840), (4, 5230420), (5, 4184336), (8, 2615210), (10, 2092168), (13, 1609360), (16, 1307605), (20, 1046084), (26, 804680), (40, 523042), (52, 402340), (65, 321872), (80, 261521), (104, 201170), (130, 160936), (208, 100585), (260, 80468), (520, 40234), (1040, 20117)]