20785779

素因数分解:

$3^2\times 7^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{367}}^1$

素因数の和:440

約数の個数: 48

約数和(自身を含む): 36741120

約数和(自身を除く): 15955341

約数列:

[1, 3, 7, 9, 21, 29, 31, 63, 87, 93, 203, 217, 261, 279, 367, 609, 651, 899, 1101, 1827, 1953, 2569, 2697, 3303, 6293, 7707, 8091, 10643, 11377, 18879, 23121, 31929, 34131, 56637, 74501, 79639, 95787, 102393, 223503, 238917, 329933, 670509, 716751, 989799, 2309531, 2969397, 6928593, 20785779]

約数ペア:

[(1, 20785779), (3, 6928593), (7, 2969397), (9, 2309531), (21, 989799), (29, 716751), (31, 670509), (63, 329933), (87, 238917), (93, 223503), (203, 102393), (217, 95787), (261, 79639), (279, 74501), (367, 56637), (609, 34131), (651, 31929), (899, 23121), (1101, 18879), (1827, 11377), (1953, 10643), (2569, 8091), (2697, 7707), (3303, 6293)]