20515516

素因数分解:

$2^2\times 7^3\times {\mathrm{19}}^1\times {\mathrm{787}}^1$

素因数の和:831

約数の個数: 48

約数和(自身を含む): 44128000

約数和(自身を除く): 23612484

約数列:

[1, 2, 4, 7, 14, 19, 28, 38, 49, 76, 98, 133, 196, 266, 343, 532, 686, 787, 931, 1372, 1574, 1862, 3148, 3724, 5509, 6517, 11018, 13034, 14953, 22036, 26068, 29906, 38563, 59812, 77126, 104671, 154252, 209342, 269941, 418684, 539882, 732697, 1079764, 1465394, 2930788, 5128879, 10257758, 20515516]

約数ペア:

[(1, 20515516), (2, 10257758), (4, 5128879), (7, 2930788), (14, 1465394), (19, 1079764), (28, 732697), (38, 539882), (49, 418684), (76, 269941), (98, 209342), (133, 154252), (196, 104671), (266, 77126), (343, 59812), (532, 38563), (686, 29906), (787, 26068), (931, 22036), (1372, 14953), (1574, 13034), (1862, 11018), (3148, 6517), (3724, 5509)]