20985160

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{149}}^1\times {\mathrm{503}}^1$

素因数の和:670

約数の個数: 64

約数和(自身を含む): 54432000

約数和(自身を除く): 33446840

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 149, 280, 298, 503, 596, 745, 1006, 1043, 1192, 1490, 2012, 2086, 2515, 2980, 3521, 4024, 4172, 5030, 5215, 5960, 7042, 8344, 10060, 10430, 14084, 17605, 20120, 20860, 28168, 35210, 41720, 70420, 74947, 140840, 149894, 299788, 374735, 524629, 599576, 749470, 1049258, 1498940, 2098516, 2623145, 2997880, 4197032, 5246290, 10492580, 20985160]

約数ペア:

[(1, 20985160), (2, 10492580), (4, 5246290), (5, 4197032), (7, 2997880), (8, 2623145), (10, 2098516), (14, 1498940), (20, 1049258), (28, 749470), (35, 599576), (40, 524629), (56, 374735), (70, 299788), (140, 149894), (149, 140840), (280, 74947), (298, 70420), (503, 41720), (596, 35210), (745, 28168), (1006, 20860), (1043, 20120), (1192, 17605), (1490, 14084), (2012, 10430), (2086, 10060), (2515, 8344), (2980, 7042), (3521, 5960), (4024, 5215), (4172, 5030)]