21000891280

素因数分解:

$2^4\times 5^1\times {\mathrm{167}}^1\times {\mathrm{1571923}}^1$

素因数の和:1572103

約数の個数: 40

約数和(自身を含む): 49119481152

約数和(自身を除く): 28118589872

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 167, 334, 668, 835, 1336, 1670, 2672, 3340, 6680, 13360, 1571923, 3143846, 6287692, 7859615, 12575384, 15719230, 25150768, 31438460, 62876920, 125753840, 262511141, 525022282, 1050044564, 1312555705, 2100089128, 2625111410, 4200178256, 5250222820, 10500445640, 21000891280]

約数ペア:

[(1, 21000891280), (2, 10500445640), (4, 5250222820), (5, 4200178256), (8, 2625111410), (10, 2100089128), (16, 1312555705), (20, 1050044564), (40, 525022282), (80, 262511141), (167, 125753840), (334, 62876920), (668, 31438460), (835, 25150768), (1336, 15719230), (1670, 12575384), (2672, 7859615), (3340, 6287692), (6680, 3143846), (13360, 1571923)]