21369825

素因数分解:

$3^4\times 5^2\times {\mathrm{61}}^1\times {\mathrm{173}}^1$

素因数の和:256

約数の個数: 60

約数和(自身を含む): 40465788

約数和(自身を除く): 19095963

約数列:

[1, 3, 5, 9, 15, 25, 27, 45, 61, 75, 81, 135, 173, 183, 225, 305, 405, 519, 549, 675, 865, 915, 1525, 1557, 1647, 2025, 2595, 2745, 4325, 4575, 4671, 4941, 7785, 8235, 10553, 12975, 13725, 14013, 23355, 24705, 31659, 38925, 41175, 52765, 70065, 94977, 116775, 123525, 158295, 263825, 284931, 350325, 474885, 791475, 854793, 1424655, 2374425, 4273965, 7123275, 21369825]

約数ペア:

[(1, 21369825), (3, 7123275), (5, 4273965), (9, 2374425), (15, 1424655), (25, 854793), (27, 791475), (45, 474885), (61, 350325), (75, 284931), (81, 263825), (135, 158295), (173, 123525), (183, 116775), (225, 94977), (305, 70065), (405, 52765), (519, 41175), (549, 38925), (675, 31659), (865, 24705), (915, 23355), (1525, 14013), (1557, 13725), (1647, 12975), (2025, 10553), (2595, 8235), (2745, 7785), (4325, 4941), (4575, 4671)]