21505960

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{89}}^1\times {\mathrm{863}}^1$

素因数の和:970

約数の個数: 64

約数和(自身を含む): 55987200

約数和(自身を除く): 34481240

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 89, 140, 178, 280, 356, 445, 623, 712, 863, 890, 1246, 1726, 1780, 2492, 3115, 3452, 3560, 4315, 4984, 6041, 6230, 6904, 8630, 12082, 12460, 17260, 24164, 24920, 30205, 34520, 48328, 60410, 76807, 120820, 153614, 241640, 307228, 384035, 537649, 614456, 768070, 1075298, 1536140, 2150596, 2688245, 3072280, 4301192, 5376490, 10752980, 21505960]

約数ペア:

[(1, 21505960), (2, 10752980), (4, 5376490), (5, 4301192), (7, 3072280), (8, 2688245), (10, 2150596), (14, 1536140), (20, 1075298), (28, 768070), (35, 614456), (40, 537649), (56, 384035), (70, 307228), (89, 241640), (140, 153614), (178, 120820), (280, 76807), (356, 60410), (445, 48328), (623, 34520), (712, 30205), (863, 24920), (890, 24164), (1246, 17260), (1726, 12460), (1780, 12082), (2492, 8630), (3115, 6904), (3452, 6230), (3560, 6041), (4315, 4984)]