21392973

素因数分解:

$3^2\times 7^1\times {\mathrm{43}}^1\times {\mathrm{53}}^1\times {\mathrm{149}}^1$

素因数の和:258

約数の個数: 48

約数和(自身を含む): 37065600

約数和(自身を除く): 15672627

約数列:

[1, 3, 7, 9, 21, 43, 53, 63, 129, 149, 159, 301, 371, 387, 447, 477, 903, 1043, 1113, 1341, 2279, 2709, 3129, 3339, 6407, 6837, 7897, 9387, 15953, 19221, 20511, 23691, 44849, 47859, 55279, 57663, 71073, 134547, 143577, 165837, 339571, 403641, 497511, 1018713, 2376997, 3056139, 7130991, 21392973]

約数ペア:

[(1, 21392973), (3, 7130991), (7, 3056139), (9, 2376997), (21, 1018713), (43, 497511), (53, 403641), (63, 339571), (129, 165837), (149, 143577), (159, 134547), (301, 71073), (371, 57663), (387, 55279), (447, 47859), (477, 44849), (903, 23691), (1043, 20511), (1113, 19221), (1341, 15953), (2279, 9387), (2709, 7897), (3129, 6837), (3339, 6407)]