21231560

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{191}}^1\times {\mathrm{397}}^1$

素因数の和:606

約数の個数: 64

約数和(自身を含む): 55019520

約数和(自身を除く): 33787960

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 191, 280, 382, 397, 764, 794, 955, 1337, 1528, 1588, 1910, 1985, 2674, 2779, 3176, 3820, 3970, 5348, 5558, 6685, 7640, 7940, 10696, 11116, 13370, 13895, 15880, 22232, 26740, 27790, 53480, 55580, 75827, 111160, 151654, 303308, 379135, 530789, 606616, 758270, 1061578, 1516540, 2123156, 2653945, 3033080, 4246312, 5307890, 10615780, 21231560]

約数ペア:

[(1, 21231560), (2, 10615780), (4, 5307890), (5, 4246312), (7, 3033080), (8, 2653945), (10, 2123156), (14, 1516540), (20, 1061578), (28, 758270), (35, 606616), (40, 530789), (56, 379135), (70, 303308), (140, 151654), (191, 111160), (280, 75827), (382, 55580), (397, 53480), (764, 27790), (794, 26740), (955, 22232), (1337, 15880), (1528, 13895), (1588, 13370), (1910, 11116), (1985, 10696), (2674, 7940), (2779, 7640), (3176, 6685), (3820, 5558), (3970, 5348)]