21854980

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{29}}^1\times {\mathrm{769}}^1$

素因数の和:821

約数の個数: 72

約数和(自身を含む): 55301400

約数和(自身を除く): 33446420

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 29, 35, 49, 58, 70, 98, 116, 140, 145, 196, 203, 245, 290, 406, 490, 580, 769, 812, 980, 1015, 1421, 1538, 2030, 2842, 3076, 3845, 4060, 5383, 5684, 7105, 7690, 10766, 14210, 15380, 21532, 22301, 26915, 28420, 37681, 44602, 53830, 75362, 89204, 107660, 111505, 150724, 156107, 188405, 223010, 312214, 376810, 446020, 624428, 753620, 780535, 1092749, 1561070, 2185498, 3122140, 4370996, 5463745, 10927490, 21854980]

約数ペア:

[(1, 21854980), (2, 10927490), (4, 5463745), (5, 4370996), (7, 3122140), (10, 2185498), (14, 1561070), (20, 1092749), (28, 780535), (29, 753620), (35, 624428), (49, 446020), (58, 376810), (70, 312214), (98, 223010), (116, 188405), (140, 156107), (145, 150724), (196, 111505), (203, 107660), (245, 89204), (290, 75362), (406, 53830), (490, 44602), (580, 37681), (769, 28420), (812, 26915), (980, 22301), (1015, 21532), (1421, 15380), (1538, 14210), (2030, 10766), (2842, 7690), (3076, 7105), (3845, 5684), (4060, 5383)]