21220120

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{109}}^1\times {\mathrm{157}}^1$

素因数の和:308

約数の個数: 64

約数和(自身を含む): 50054400

約数和(自身を除く): 28834280

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 109, 124, 155, 157, 218, 248, 310, 314, 436, 545, 620, 628, 785, 872, 1090, 1240, 1256, 1570, 2180, 3140, 3379, 4360, 4867, 6280, 6758, 9734, 13516, 16895, 17113, 19468, 24335, 27032, 33790, 34226, 38936, 48670, 67580, 68452, 85565, 97340, 135160, 136904, 171130, 194680, 342260, 530503, 684520, 1061006, 2122012, 2652515, 4244024, 5305030, 10610060, 21220120]

約数ペア:

[(1, 21220120), (2, 10610060), (4, 5305030), (5, 4244024), (8, 2652515), (10, 2122012), (20, 1061006), (31, 684520), (40, 530503), (62, 342260), (109, 194680), (124, 171130), (155, 136904), (157, 135160), (218, 97340), (248, 85565), (310, 68452), (314, 67580), (436, 48670), (545, 38936), (620, 34226), (628, 33790), (785, 27032), (872, 24335), (1090, 19468), (1240, 17113), (1256, 16895), (1570, 13516), (2180, 9734), (3140, 6758), (3379, 6280), (4360, 4867)]