21287140

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{383}}^1\times {\mathrm{397}}^1$

素因数の和:796

約数の個数: 48

約数和(自身を含む): 51351552

約数和(自身を除く): 30064412

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 383, 397, 766, 794, 1532, 1588, 1915, 1985, 2681, 2779, 3830, 3970, 5362, 5558, 7660, 7940, 10724, 11116, 13405, 13895, 26810, 27790, 53620, 55580, 152051, 304102, 608204, 760255, 1064357, 1520510, 2128714, 3041020, 4257428, 5321785, 10643570, 21287140]

約数ペア:

[(1, 21287140), (2, 10643570), (4, 5321785), (5, 4257428), (7, 3041020), (10, 2128714), (14, 1520510), (20, 1064357), (28, 760255), (35, 608204), (70, 304102), (140, 152051), (383, 55580), (397, 53620), (766, 27790), (794, 26810), (1532, 13895), (1588, 13405), (1915, 11116), (1985, 10724), (2681, 7940), (2779, 7660), (3830, 5558), (3970, 5362)]