21780460

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{4409}}^1$

素因数の和:4450

約数の個数: 48

約数和(自身を含む): 51861600

約数和(自身を除く): 30081140

約数列:

[1, 2, 4, 5, 10, 13, 19, 20, 26, 38, 52, 65, 76, 95, 130, 190, 247, 260, 380, 494, 988, 1235, 2470, 4409, 4940, 8818, 17636, 22045, 44090, 57317, 83771, 88180, 114634, 167542, 229268, 286585, 335084, 418855, 573170, 837710, 1089023, 1146340, 1675420, 2178046, 4356092, 5445115, 10890230, 21780460]

約数ペア:

[(1, 21780460), (2, 10890230), (4, 5445115), (5, 4356092), (10, 2178046), (13, 1675420), (19, 1146340), (20, 1089023), (26, 837710), (38, 573170), (52, 418855), (65, 335084), (76, 286585), (95, 229268), (130, 167542), (190, 114634), (247, 88180), (260, 83771), (380, 57317), (494, 44090), (988, 22045), (1235, 17636), (2470, 8818), (4409, 4940)]