21171280

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20357}}^1$

素因数の和:20383

約数の個数: 40

約数和(自身を含む): 53012232

約数和(自身を除く): 31840952

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20357, 40714, 81428, 101785, 162856, 203570, 264641, 325712, 407140, 529282, 814280, 1058564, 1323205, 1628560, 2117128, 2646410, 4234256, 5292820, 10585640, 21171280]

約数ペア:

[(1, 21171280), (2, 10585640), (4, 5292820), (5, 4234256), (8, 2646410), (10, 2117128), (13, 1628560), (16, 1323205), (20, 1058564), (26, 814280), (40, 529282), (52, 407140), (65, 325712), (80, 264641), (104, 203570), (130, 162856), (208, 101785), (260, 81428), (520, 40714), (1040, 20357)]