21690800

素因数分解:

$2^4\times 5^2\times {\mathrm{211}}^1\times {\mathrm{257}}^1$

素因数の和:486

約数の個数: 60

約数和(自身を含む): 52562856

約数和(自身を除く): 30872056

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 211, 257, 400, 422, 514, 844, 1028, 1055, 1285, 1688, 2056, 2110, 2570, 3376, 4112, 4220, 5140, 5275, 6425, 8440, 10280, 10550, 12850, 16880, 20560, 21100, 25700, 42200, 51400, 54227, 84400, 102800, 108454, 216908, 271135, 433816, 542270, 867632, 1084540, 1355675, 2169080, 2711350, 4338160, 5422700, 10845400, 21690800]

約数ペア:

[(1, 21690800), (2, 10845400), (4, 5422700), (5, 4338160), (8, 2711350), (10, 2169080), (16, 1355675), (20, 1084540), (25, 867632), (40, 542270), (50, 433816), (80, 271135), (100, 216908), (200, 108454), (211, 102800), (257, 84400), (400, 54227), (422, 51400), (514, 42200), (844, 25700), (1028, 21100), (1055, 20560), (1285, 16880), (1688, 12850), (2056, 10550), (2110, 10280), (2570, 8440), (3376, 6425), (4112, 5275), (4220, 5140)]