20987960

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{3259}}^1$

素因数の和:3300

約数の個数: 64

約数和(自身を含む): 56332800

約数和(自身を除く): 35344840

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 23, 28, 35, 40, 46, 56, 70, 92, 115, 140, 161, 184, 230, 280, 322, 460, 644, 805, 920, 1288, 1610, 3220, 3259, 6440, 6518, 13036, 16295, 22813, 26072, 32590, 45626, 65180, 74957, 91252, 114065, 130360, 149914, 182504, 228130, 299828, 374785, 456260, 524699, 599656, 749570, 912520, 1049398, 1499140, 2098796, 2623495, 2998280, 4197592, 5246990, 10493980, 20987960]

約数ペア:

[(1, 20987960), (2, 10493980), (4, 5246990), (5, 4197592), (7, 2998280), (8, 2623495), (10, 2098796), (14, 1499140), (20, 1049398), (23, 912520), (28, 749570), (35, 599656), (40, 524699), (46, 456260), (56, 374785), (70, 299828), (92, 228130), (115, 182504), (140, 149914), (161, 130360), (184, 114065), (230, 91252), (280, 74957), (322, 65180), (460, 45626), (644, 32590), (805, 26072), (920, 22813), (1288, 16295), (1610, 13036), (3220, 6518), (3259, 6440)]