20851840

素因数分解:

$2^7\times 5^1\times {\mathrm{31}}^1\times {\mathrm{1051}}^1$

素因数の和:1101

約数の個数: 64

約数和(自身を含む): 51505920

約数和(自身を除く): 30654080

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 310, 320, 496, 620, 640, 992, 1051, 1240, 1984, 2102, 2480, 3968, 4204, 4960, 5255, 8408, 9920, 10510, 16816, 19840, 21020, 32581, 33632, 42040, 65162, 67264, 84080, 130324, 134528, 162905, 168160, 260648, 325810, 336320, 521296, 651620, 672640, 1042592, 1303240, 2085184, 2606480, 4170368, 5212960, 10425920, 20851840]

約数ペア:

[(1, 20851840), (2, 10425920), (4, 5212960), (5, 4170368), (8, 2606480), (10, 2085184), (16, 1303240), (20, 1042592), (31, 672640), (32, 651620), (40, 521296), (62, 336320), (64, 325810), (80, 260648), (124, 168160), (128, 162905), (155, 134528), (160, 130324), (248, 84080), (310, 67264), (320, 65162), (496, 42040), (620, 33632), (640, 32581), (992, 21020), (1051, 19840), (1240, 16816), (1984, 10510), (2102, 9920), (2480, 8408), (3968, 5255), (4204, 4960)]