21781380

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{71}}^1\times {\mathrm{5113}}^1$

素因数の和:5196

約数の個数: 48

約数和(自身を含む): 61858944

約数和(自身を除く): 40077564

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 71, 142, 213, 284, 355, 426, 710, 852, 1065, 1420, 2130, 4260, 5113, 10226, 15339, 20452, 25565, 30678, 51130, 61356, 76695, 102260, 153390, 306780, 363023, 726046, 1089069, 1452092, 1815115, 2178138, 3630230, 4356276, 5445345, 7260460, 10890690, 21781380]

約数ペア:

[(1, 21781380), (2, 10890690), (3, 7260460), (4, 5445345), (5, 4356276), (6, 3630230), (10, 2178138), (12, 1815115), (15, 1452092), (20, 1089069), (30, 726046), (60, 363023), (71, 306780), (142, 153390), (213, 102260), (284, 76695), (355, 61356), (426, 51130), (710, 30678), (852, 25565), (1065, 20452), (1420, 15339), (2130, 10226), (4260, 5113)]