21281920

素因数分解:

$2^7\times 5^1\times {\mathrm{11}}^1\times {\mathrm{3023}}^1$

素因数の和:3053

約数の個数: 64

約数和(自身を含む): 55520640

約数和(自身を除く): 34238720

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 32, 40, 44, 55, 64, 80, 88, 110, 128, 160, 176, 220, 320, 352, 440, 640, 704, 880, 1408, 1760, 3023, 3520, 6046, 7040, 12092, 15115, 24184, 30230, 33253, 48368, 60460, 66506, 96736, 120920, 133012, 166265, 193472, 241840, 266024, 332530, 386944, 483680, 532048, 665060, 967360, 1064096, 1330120, 1934720, 2128192, 2660240, 4256384, 5320480, 10640960, 21281920]

約数ペア:

[(1, 21281920), (2, 10640960), (4, 5320480), (5, 4256384), (8, 2660240), (10, 2128192), (11, 1934720), (16, 1330120), (20, 1064096), (22, 967360), (32, 665060), (40, 532048), (44, 483680), (55, 386944), (64, 332530), (80, 266024), (88, 241840), (110, 193472), (128, 166265), (160, 133012), (176, 120920), (220, 96736), (320, 66506), (352, 60460), (440, 48368), (640, 33253), (704, 30230), (880, 24184), (1408, 15115), (1760, 12092), (3023, 7040), (3520, 6046)]