21401720

素因数分解:

$2^3\times 5^1\times {\mathrm{479}}^1\times {\mathrm{1117}}^1$

素因数の和:1607

約数の個数: 32

約数和(自身を含む): 48297600

約数和(自身を除く): 26895880

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 479, 958, 1117, 1916, 2234, 2395, 3832, 4468, 4790, 5585, 8936, 9580, 11170, 19160, 22340, 44680, 535043, 1070086, 2140172, 2675215, 4280344, 5350430, 10700860, 21401720]

約数ペア:

[(1, 21401720), (2, 10700860), (4, 5350430), (5, 4280344), (8, 2675215), (10, 2140172), (20, 1070086), (40, 535043), (479, 44680), (958, 22340), (1117, 19160), (1916, 11170), (2234, 9580), (2395, 8936), (3832, 5585), (4468, 4790)]