638131280

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{257311}}^1$

素因数の和:257355

約数の個数: 40

約数和(自身を含む): 1531521024

約数和(自身を除く): 893389744

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 155, 248, 310, 496, 620, 1240, 2480, 257311, 514622, 1029244, 1286555, 2058488, 2573110, 4116976, 5146220, 7976641, 10292440, 15953282, 20584880, 31906564, 39883205, 63813128, 79766410, 127626256, 159532820, 319065640, 638131280]

約数ペア:

[(1, 638131280), (2, 319065640), (4, 159532820), (5, 127626256), (8, 79766410), (10, 63813128), (16, 39883205), (20, 31906564), (31, 20584880), (40, 15953282), (62, 10292440), (80, 7976641), (124, 5146220), (155, 4116976), (248, 2573110), (310, 2058488), (496, 1286555), (620, 1029244), (1240, 514622), (2480, 257311)]