21138280

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{17047}}^1$

素因数の和:17089

約数の個数: 32

約数和(自身を含む): 49098240

約数和(自身を除く): 27959960

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 17047, 34094, 68188, 85235, 136376, 170470, 340940, 528457, 681880, 1056914, 2113828, 2642285, 4227656, 5284570, 10569140, 21138280]

約数ペア:

[(1, 21138280), (2, 10569140), (4, 5284570), (5, 4227656), (8, 2642285), (10, 2113828), (20, 1056914), (31, 681880), (40, 528457), (62, 340940), (124, 170470), (155, 136376), (248, 85235), (310, 68188), (620, 34094), (1240, 17047)]