639452020

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{67}}^1\times {\mathrm{7823}}^1$

素因数の和:7960

約数の個数: 48

約数和(自身を含む): 1385411328

約数和(自身を除く): 745959308

約数列:

[1, 2, 4, 5, 10, 20, 61, 67, 122, 134, 244, 268, 305, 335, 610, 670, 1220, 1340, 4087, 7823, 8174, 15646, 16348, 20435, 31292, 39115, 40870, 78230, 81740, 156460, 477203, 524141, 954406, 1048282, 1908812, 2096564, 2386015, 2620705, 4772030, 5241410, 9544060, 10482820, 31972601, 63945202, 127890404, 159863005, 319726010, 639452020]

約数ペア:

[(1, 639452020), (2, 319726010), (4, 159863005), (5, 127890404), (10, 63945202), (20, 31972601), (61, 10482820), (67, 9544060), (122, 5241410), (134, 4772030), (244, 2620705), (268, 2386015), (305, 2096564), (335, 1908812), (610, 1048282), (670, 954406), (1220, 524141), (1340, 477203), (4087, 156460), (7823, 81740), (8174, 78230), (15646, 40870), (16348, 39115), (20435, 31292)]