21506715

素因数分解:

$3^5\times 5^1\times {\mathrm{31}}^1\times {\mathrm{571}}^1$

素因数の和:622

約数の個数: 48

約数和(自身を含む): 39975936

約数和(自身を除く): 18469221

約数列:

[1, 3, 5, 9, 15, 27, 31, 45, 81, 93, 135, 155, 243, 279, 405, 465, 571, 837, 1215, 1395, 1713, 2511, 2855, 4185, 5139, 7533, 8565, 12555, 15417, 17701, 25695, 37665, 46251, 53103, 77085, 88505, 138753, 159309, 231255, 265515, 477927, 693765, 796545, 1433781, 2389635, 4301343, 7168905, 21506715]

約数ペア:

[(1, 21506715), (3, 7168905), (5, 4301343), (9, 2389635), (15, 1433781), (27, 796545), (31, 693765), (45, 477927), (81, 265515), (93, 231255), (135, 159309), (155, 138753), (243, 88505), (279, 77085), (405, 53103), (465, 46251), (571, 37665), (837, 25695), (1215, 17701), (1395, 15417), (1713, 12555), (2511, 8565), (2855, 7533), (4185, 5139)]