21280725

素因数分解:

$3^5\times 5^2\times {\mathrm{31}}^1\times {\mathrm{113}}^1$

素因数の和:169

約数の個数: 72

約数和(自身を含む): 41164032

約数和(自身を除く): 19883307

約数列:

[1, 3, 5, 9, 15, 25, 27, 31, 45, 75, 81, 93, 113, 135, 155, 225, 243, 279, 339, 405, 465, 565, 675, 775, 837, 1017, 1215, 1395, 1695, 2025, 2325, 2511, 2825, 3051, 3503, 4185, 5085, 6075, 6975, 7533, 8475, 9153, 10509, 12555, 15255, 17515, 20925, 25425, 27459, 31527, 37665, 45765, 52545, 62775, 76275, 87575, 94581, 137295, 157635, 188325, 228825, 262725, 283743, 472905, 686475, 788175, 851229, 1418715, 2364525, 4256145, 7093575, 21280725]

約数ペア:

[(1, 21280725), (3, 7093575), (5, 4256145), (9, 2364525), (15, 1418715), (25, 851229), (27, 788175), (31, 686475), (45, 472905), (75, 283743), (81, 262725), (93, 228825), (113, 188325), (135, 157635), (155, 137295), (225, 94581), (243, 87575), (279, 76275), (339, 62775), (405, 52545), (465, 45765), (565, 37665), (675, 31527), (775, 27459), (837, 25425), (1017, 20925), (1215, 17515), (1395, 15255), (1695, 12555), (2025, 10509), (2325, 9153), (2511, 8475), (2825, 7533), (3051, 6975), (3503, 6075), (4185, 5085)]