18988840

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^2\times {\mathrm{53}}^2$

素因数の和:143

約数の個数: 72

約数和(自身を含む): 47153610

約数和(自身を除く): 28164770

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 53, 65, 104, 106, 130, 169, 212, 260, 265, 338, 424, 520, 530, 676, 689, 845, 1060, 1352, 1378, 1690, 2120, 2756, 2809, 3380, 3445, 5512, 5618, 6760, 6890, 8957, 11236, 13780, 14045, 17914, 22472, 27560, 28090, 35828, 36517, 44785, 56180, 71656, 73034, 89570, 112360, 146068, 179140, 182585, 292136, 358280, 365170, 474721, 730340, 949442, 1460680, 1898884, 2373605, 3797768, 4747210, 9494420, 18988840]

約数ペア:

[(1, 18988840), (2, 9494420), (4, 4747210), (5, 3797768), (8, 2373605), (10, 1898884), (13, 1460680), (20, 949442), (26, 730340), (40, 474721), (52, 365170), (53, 358280), (65, 292136), (104, 182585), (106, 179140), (130, 146068), (169, 112360), (212, 89570), (260, 73034), (265, 71656), (338, 56180), (424, 44785), (520, 36517), (530, 35828), (676, 28090), (689, 27560), (845, 22472), (1060, 17914), (1352, 14045), (1378, 13780), (1690, 11236), (2120, 8957), (2756, 6890), (2809, 6760), (3380, 5618), (3445, 5512)]