81405660

素因数分解:

$2^2\times 3^1\times 5^1\times 7^2\times {\mathrm{27689}}^1$

素因数の和:27715

約数の個数: 72

約数和(自身を含む): 265159440

約数和(自身を除く): 183753780

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 49, 60, 70, 84, 98, 105, 140, 147, 196, 210, 245, 294, 420, 490, 588, 735, 980, 1470, 2940, 27689, 55378, 83067, 110756, 138445, 166134, 193823, 276890, 332268, 387646, 415335, 553780, 581469, 775292, 830670, 969115, 1162938, 1356761, 1661340, 1938230, 2325876, 2713522, 2907345, 3876460, 4070283, 5427044, 5814690, 6783805, 8140566, 11629380, 13567610, 16281132, 20351415, 27135220, 40702830, 81405660]

約数ペア:

[(1, 81405660), (2, 40702830), (3, 27135220), (4, 20351415), (5, 16281132), (6, 13567610), (7, 11629380), (10, 8140566), (12, 6783805), (14, 5814690), (15, 5427044), (20, 4070283), (21, 3876460), (28, 2907345), (30, 2713522), (35, 2325876), (42, 1938230), (49, 1661340), (60, 1356761), (70, 1162938), (84, 969115), (98, 830670), (105, 775292), (140, 581469), (147, 553780), (196, 415335), (210, 387646), (245, 332268), (294, 276890), (420, 193823), (490, 166134), (588, 138445), (735, 110756), (980, 83067), (1470, 55378), (2940, 27689)]