21357584

素因数分解:

$2^4\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{839}}^1$

素因数の和:927

約数の個数: 40

約数和(自身を含む): 43538880

約数和(自身を除く): 22181296

約数列:

[1, 2, 4, 8, 16, 37, 43, 74, 86, 148, 172, 296, 344, 592, 688, 839, 1591, 1678, 3182, 3356, 6364, 6712, 12728, 13424, 25456, 31043, 36077, 62086, 72154, 124172, 144308, 248344, 288616, 496688, 577232, 1334849, 2669698, 5339396, 10678792, 21357584]

約数ペア:

[(1, 21357584), (2, 10678792), (4, 5339396), (8, 2669698), (16, 1334849), (37, 577232), (43, 496688), (74, 288616), (86, 248344), (148, 144308), (172, 124172), (296, 72154), (344, 62086), (592, 36077), (688, 31043), (839, 25456), (1591, 13424), (1678, 12728), (3182, 6712), (3356, 6364)]