20556640

素因数分解:

$2^5\times 5^1\times {\mathrm{13}}^1\times {\mathrm{9883}}^1$

素因数の和:9911

約数の個数: 48

約数和(自身を含む): 52306128

約数和(自身を除く): 31749488

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 65, 80, 104, 130, 160, 208, 260, 416, 520, 1040, 2080, 9883, 19766, 39532, 49415, 79064, 98830, 128479, 158128, 197660, 256958, 316256, 395320, 513916, 642395, 790640, 1027832, 1284790, 1581280, 2055664, 2569580, 4111328, 5139160, 10278320, 20556640]

約数ペア:

[(1, 20556640), (2, 10278320), (4, 5139160), (5, 4111328), (8, 2569580), (10, 2055664), (13, 1581280), (16, 1284790), (20, 1027832), (26, 790640), (32, 642395), (40, 513916), (52, 395320), (65, 316256), (80, 256958), (104, 197660), (130, 158128), (160, 128479), (208, 98830), (260, 79064), (416, 49415), (520, 39532), (1040, 19766), (2080, 9883)]