20286400

素因数分解:

$2^6\times 5^2\times {\mathrm{31}}^1\times {\mathrm{409}}^1$

素因数の和:462

約数の個数: 84

約数和(自身を含む): 51653440

約数和(自身を除く): 31367040

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 31, 32, 40, 50, 62, 64, 80, 100, 124, 155, 160, 200, 248, 310, 320, 400, 409, 496, 620, 775, 800, 818, 992, 1240, 1550, 1600, 1636, 1984, 2045, 2480, 3100, 3272, 4090, 4960, 6200, 6544, 8180, 9920, 10225, 12400, 12679, 13088, 16360, 20450, 24800, 25358, 26176, 32720, 40900, 49600, 50716, 63395, 65440, 81800, 101432, 126790, 130880, 163600, 202864, 253580, 316975, 327200, 405728, 507160, 633950, 654400, 811456, 1014320, 1267900, 2028640, 2535800, 4057280, 5071600, 10143200, 20286400]

約数ペア:

[(1, 20286400), (2, 10143200), (4, 5071600), (5, 4057280), (8, 2535800), (10, 2028640), (16, 1267900), (20, 1014320), (25, 811456), (31, 654400), (32, 633950), (40, 507160), (50, 405728), (62, 327200), (64, 316975), (80, 253580), (100, 202864), (124, 163600), (155, 130880), (160, 126790), (200, 101432), (248, 81800), (310, 65440), (320, 63395), (400, 50716), (409, 49600), (496, 40900), (620, 32720), (775, 26176), (800, 25358), (818, 24800), (992, 20450), (1240, 16360), (1550, 13088), (1600, 12679), (1636, 12400), (1984, 10225), (2045, 9920), (2480, 8180), (3100, 6544), (3272, 6200), (4090, 4960)]