21780525

素因数分解:

$3^1\times 5^2\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{251}}^1$

素因数の和:366

約数の個数: 48

約数和(自身を含む): 39372480

約数和(自身を除く): 17591955

約数列:

[1, 3, 5, 13, 15, 25, 39, 65, 75, 89, 195, 251, 267, 325, 445, 753, 975, 1157, 1255, 1335, 2225, 3263, 3471, 3765, 5785, 6275, 6675, 9789, 16315, 17355, 18825, 22339, 28925, 48945, 67017, 81575, 86775, 111695, 244725, 290407, 335085, 558475, 871221, 1452035, 1675425, 4356105, 7260175, 21780525]

約数ペア:

[(1, 21780525), (3, 7260175), (5, 4356105), (13, 1675425), (15, 1452035), (25, 871221), (39, 558475), (65, 335085), (75, 290407), (89, 244725), (195, 111695), (251, 86775), (267, 81575), (325, 67017), (445, 48945), (753, 28925), (975, 22339), (1157, 18825), (1255, 17355), (1335, 16315), (2225, 9789), (3263, 6675), (3471, 6275), (3765, 5785)]