20921835

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{149}}^1$

素因数の和:228

約数の個数: 64

約数和(自身を含む): 39398400

約数和(自身を除く): 18476565

約数列:

[1, 3, 5, 11, 15, 23, 33, 37, 55, 69, 111, 115, 149, 165, 185, 253, 345, 407, 447, 555, 745, 759, 851, 1221, 1265, 1639, 2035, 2235, 2553, 3427, 3795, 4255, 4917, 5513, 6105, 8195, 9361, 10281, 12765, 16539, 17135, 24585, 27565, 28083, 37697, 46805, 51405, 60643, 82695, 113091, 126799, 140415, 181929, 188485, 303215, 380397, 565455, 633995, 909645, 1394789, 1901985, 4184367, 6973945, 20921835]

約数ペア:

[(1, 20921835), (3, 6973945), (5, 4184367), (11, 1901985), (15, 1394789), (23, 909645), (33, 633995), (37, 565455), (55, 380397), (69, 303215), (111, 188485), (115, 181929), (149, 140415), (165, 126799), (185, 113091), (253, 82695), (345, 60643), (407, 51405), (447, 46805), (555, 37697), (745, 28083), (759, 27565), (851, 24585), (1221, 17135), (1265, 16539), (1639, 12765), (2035, 10281), (2235, 9361), (2553, 8195), (3427, 6105), (3795, 5513), (4255, 4917)]