20989185

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{29}}^1\times {\mathrm{61}}^1\times {\mathrm{113}}^1$

素因数の和:218

約数の個数: 64

約数和(自身を含む): 40711680

約数和(自身を除く): 19722495

約数列:

[1, 3, 5, 7, 15, 21, 29, 35, 61, 87, 105, 113, 145, 183, 203, 305, 339, 427, 435, 565, 609, 791, 915, 1015, 1281, 1695, 1769, 2135, 2373, 3045, 3277, 3955, 5307, 6405, 6893, 8845, 9831, 11865, 12383, 16385, 20679, 22939, 26535, 34465, 37149, 48251, 49155, 61915, 68817, 103395, 114695, 144753, 185745, 199897, 241255, 344085, 599691, 723765, 999485, 1399279, 2998455, 4197837, 6996395, 20989185]

約数ペア:

[(1, 20989185), (3, 6996395), (5, 4197837), (7, 2998455), (15, 1399279), (21, 999485), (29, 723765), (35, 599691), (61, 344085), (87, 241255), (105, 199897), (113, 185745), (145, 144753), (183, 114695), (203, 103395), (305, 68817), (339, 61915), (427, 49155), (435, 48251), (565, 37149), (609, 34465), (791, 26535), (915, 22939), (1015, 20679), (1281, 16385), (1695, 12383), (1769, 11865), (2135, 9831), (2373, 8845), (3045, 6893), (3277, 6405), (3955, 5307)]