21266840

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{151}}^1\times {\mathrm{503}}^1$

素因数の和:672

約数の個数: 64

約数和(自身を含む): 55157760

約数和(自身を除く): 33890920

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 151, 280, 302, 503, 604, 755, 1006, 1057, 1208, 1510, 2012, 2114, 2515, 3020, 3521, 4024, 4228, 5030, 5285, 6040, 7042, 8456, 10060, 10570, 14084, 17605, 20120, 21140, 28168, 35210, 42280, 70420, 75953, 140840, 151906, 303812, 379765, 531671, 607624, 759530, 1063342, 1519060, 2126684, 2658355, 3038120, 4253368, 5316710, 10633420, 21266840]

約数ペア:

[(1, 21266840), (2, 10633420), (4, 5316710), (5, 4253368), (7, 3038120), (8, 2658355), (10, 2126684), (14, 1519060), (20, 1063342), (28, 759530), (35, 607624), (40, 531671), (56, 379765), (70, 303812), (140, 151906), (151, 140840), (280, 75953), (302, 70420), (503, 42280), (604, 35210), (755, 28168), (1006, 21140), (1057, 20120), (1208, 17605), (1510, 14084), (2012, 10570), (2114, 10060), (2515, 8456), (3020, 7042), (3521, 6040), (4024, 5285), (4228, 5030)]